Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6f010a8aeacae1b…

MALICIOUS

PDF

78.8 KB Created: 2021-09-04 01:32:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5405b09d3303b58b5738f47366d2a766 SHA-1: e918344504b886649d0e1f041489327b4087ee37 SHA-256: b6f010a8aeacae1bc984a5ef17b3a005076ae3f78f189ad7851ef614e0c64fdb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt, likely leveraging a PDF exploit or social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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 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://eva.am/files/e9e88445ea19e77d.pdf In PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160788a15b2ca9---fapoxi.pdfIn PDF document text
    • https://sayurhijau.com/contents//files/76005423288.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16109f94c57043---xusijuwofu.pdfIn PDF document text
    • http://leasingtowers.com/ckfinder/userfiles/files/dinutowetejarizovez.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/3c4a8b7cf63cce91d23ed444bf1fe92f/28198530042.pdfIn PDF document text
    • http://kleinschaden.expert/userfiles/file/kararevubozidenavuke.pdfIn PDF document text
    • http://rheinmotel.com/userfiles/file/mivejetutinisi.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/pijin.pdfIn PDF document text
    • https://classconnbio.com/img-jacson/files/paguxizigigemobam.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/33d94253a1e357a01b858d83de14c366/vogopipoweramobiw.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/cc5baba56d630546a5a78ee3ba994c04/29454213775.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fbdc6f856e2---gejeforebukipubijenewoza.pdfIn PDF document text
    • http://www.edgartownschool.org/uploads/files/91751253843.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160ce33b29f630---26366462830.pdfIn PDF document text
    • http://siamsankyo.com/Uploads/file/kafedenetebat.pdfIn PDF document text
    • https://smshealthcareservices.com/ckfinder/userfiles/files/lulolakakozugova.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/2d25672b49b2fb025f49fc6d4d71f90b/fifex.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a7178a2715d---birazixewasatironiwig.pdfIn PDF document text
    • https://topupdana.com/contents//files/69953805290.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=tcl+air+conditioner+manual+e6PDF 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_off0000d336.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD336 16744 bytes
SHA-256: e0610ed8d8d7c4bb47d9fa646ec497df8e7e85d16254b8f53cf445ebe7ca5f51
font_01_sfnt_off0000fe02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE02 10596 bytes
SHA-256: f03e34ade14328c769bf73a9755fa01e0e04ef5c15f2005ab77e126eeddf2450
font_02_sfnt_off00011632.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11632 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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