Malicious PDF — malware analysis report

Static analysis result for SHA-256 838180a6480ae98a…

MALICIOUS

PDF

74.2 KB Created: 2021-09-02 00:25:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: c4f8eb3d12a2f763a7a5a8a0c69b039f SHA-1: 779917a1385db0a14eea7feb42155d53373a83a5 SHA-256: 838180a6480ae98a42fe7a3aa8bc8d6b6f8266940e282dd55064ce8d26bae1f0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Static analysis reveals it functions as a link farm, containing numerous URLs pointing to potentially compromised WordPress sites and other domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests the intent is to lure users through search engine optimization to these links, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/16112de7dacf22---50989464258.pdf In PDF document text
    • https://pui-vital.ro/msg_media/file/xorerelemilevuzi.pdfIn PDF document text
    • https://menu2uplus.com/images/file/naturoruv.pdfIn PDF document text
    • http://misterholidaysanprisco.it/userfiles/files/20273145313.pdfIn PDF document text
    • http://cdmatik.com/uploads/file/zufemomemosejoso.pdfIn PDF document text
    • http://heritagecarletonplace.com/clients/c/c2/c23aa4fb54f25340752d20cfcff880b2/File/fifab.pdfIn PDF document text
    • https://briljant-maleri.se/UserFiles/files/21912282185.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/juzozif.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607300739723b---jimiziw.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/2bf6arnjuqeeidojdr08jao08a/visejig.pdfIn PDF document text
    • https://aduanaldelvalle.mx/userfiles/file/53186064481.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/ef3d2044eb4432d0b54f89dfc4ca4323/weluzax.pdfIn PDF document text
    • http://architettipassarinmarzotto.com/userfiles/files/jusaxenusevetezaxefox.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/fulugeg.pdfIn PDF document text
    • http://club-integra.ru/userfiles/file/92766094045.pdfIn PDF document text
    • http://djpress.pl/Image/files/53866554770.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a9edf2d1b8---2539629084.pdfIn PDF document text
    • http://crocepadrekolbe.it/userfiles/files/13737647300.pdfIn PDF document text
    • http://jkmdc.com/aversystem.com/userfiles/file/10494288778.pdfIn PDF document text
    • http://vallovin.it/userfiles/files/vupidilexomiwajibofolibog.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/lqrhog9b3ft9nbqp34f126q4b0/geditofosifodaxiwamikug.pdfIn PDF document text
    • http://grandchainfamilyfoundation.org/clients/85333/File/7889496567.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/lo9l0j1ji756789uhlvc4p9rov/dowapupumiguvuzope.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fef65955ad---14657683884.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=pyriform+fossa+meaningPDF 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_off0000babe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBABE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d2d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2D5 10528 bytes
SHA-256: 62046c1744345b968dba6fc6236ba21f6e045f7dfea2bae3db8277b42b422ecb
font_02_sfnt_off0000ead0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD0 18352 bytes
SHA-256: b793f751e66477736c2f206af95c477bc3a1fa220163c64e90db383553d91496

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