Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8679e6b244d5986…

MALICIOUS

PDF

114.3 KB Created: 2021-07-05 12:31:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: ad089d565067b3d5111967c7484ff20a SHA-1: 7375d59be6b64ec60da1d668bd4f420fb0c253df SHA-256: f8679e6b244d5986ff2896f5cd898d7729fa9bc01935bdecb57056f1f74b9d71
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to potentially compromised WordPress upload directories and disposable hosting domains, likely to facilitate the download of a second-stage payload. The presence of external URIs and PDF link farms suggests an attempt to trick users into downloading further malicious content, aligning with a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9805

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://hugslock.com/app/webroot/img/files/zimirilavoraputewitukaw.pdf In PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16070cb7e0f820---32573055100.pdfIn PDF document text
    • https://viticoltura-enologia.com/file/xuvekafu.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c68cbd34417---nomilopiwutetimurenepikip.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a81d79c09e2---14544376509.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b74536e896d---maxeva.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/ripobe.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/9c971ff75a2c329694dc9b253d255a3f/45865437442.pdfIn PDF document text
    • http://ambulatorioveterinariosantanna.eu/userfiles/files/wupaseg.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e431f96432---tirox.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/bc663101a58e7b4ebb3eefd5a93846cb/viwavulilotorifalib.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/155656546260d9c38909c5e.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/492d3ec23fb80d71eb94dbe5073f833d/99958147715.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1f781d137---gujefikerifonezun.pdfIn PDF document text
    • http://campbellelectronics.com/uploads/dovev.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ac61a02b1---99745276070.pdfIn PDF document text
    • https://vydavatelstvoklett.sk/userfiles/file/tedafagodagezonaj.pdfIn PDF document text
    • http://mcutech.net/upload/2021/06/file/16230340211175801486.pdfIn PDF document text
    • http://uralinteh.com/uploads/files/37428521375.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/sokixigazijesefotu.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/r9s7qheg10a2rb0hnjcpmp6ch7/doxefutiz.pdfIn PDF document text
    • http://universe-micro.com/upload/files/20210705_054228.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc57af20520---ridupuxabo.pdfIn PDF document text
    • http://apartmaji-zunicmile.com/uporabnik/file/pukatilo.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/h278d7r0dv9djbhd56uufjbaps/38651601499.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1607739eb48a1d---6835480136.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/cdde4eaf1fbfbc4fb5597f2843bd0ef0/48036043503.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=theoretical+perspectives+in+relation+to+speech+language+and+communicationPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015cb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CB6 11092 bytes
SHA-256: bdf512480b466a820b129aca19ed43515680565532aed2a60d0ba2bd20c75b44
font_01_sfnt_off00017631.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17631 16892 bytes
SHA-256: 3a1cbccdbb3ab78a86843c764547052bef5d8bcafc1dcbfe00e20e4b05dd44e8
font_02_sfnt_off0001a27a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A27A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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