Malicious PDF — malware analysis report

Static analysis result for SHA-256 a478401e5dbf568f…

MALICIOUS

PDF

93.0 KB Created: 2021-09-03 21:37:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0ebf0094f14f89df05674cfae0af4ed7 SHA-1: 6f2a1968fe59b9623274514f18629ce9b1ac6a86 SHA-256: a478401e5dbf568f212ba322706a66353247553148ca8fe39106273166c71f60
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm used for phishing or malware distribution. The presence of embedded URLs and the overall structure point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://crewmak.ru/uplcv?utm_term=insight+monthly+current+affairs+january+2019+pdf+download PDF link annotation
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072cb8b60b7f---botojuvolakasasu.pdfIn PDF document text
    • http://sampoernastrategic.com/uploads/image/files/67296352239.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210509232252673970391.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16072a22247b83---nemenajavexebezulipaluz.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/ada83cca55c5150fcdebdcd4cdf0fba9/88496956623.pdfIn PDF document text
    • http://abwferrellpkwy.com/uploads/files/23981971593.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/26850626571.pdfIn PDF document text
    • https://securitydm.rs/slicice/file/12362378299.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/494e3a922ce5f4386b5e4c6e4ecee808/47556685784.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/50ed1315035e78edde70f8673b2651a4/guvixinewomus.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/8f75bd6de4898ab32c97b047b7bde3aa/vemujese.pdfIn PDF document text
    • http://kpotplace.com/uploads/files/98755827332.pdfIn PDF document text
    • http://ekachaiguitarist.com/ckfinder/userfiles/files/xuximidenuvisaxizin.pdfIn PDF document text
    • http://randoquad72.fr/userfiles/file/47454354158.pdfIn PDF document text
    • https://biothiennam.com/media/ftp/file/38750525576.pdfIn PDF document text
    • http://www.domplit2006.ru/ckfinder/userfiles/files/47610503695.pdfIn PDF document text
    • https://lifetides.ca/cambridge/uploads/files/42235689289.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/161145c26a73a0---92692416177.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/40512085156.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/zowovutubafebesefofem.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071c32955af5---28085406846.pdfIn PDF document text
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/guvikuvudumisopabat.pdfIn PDF document text
    • 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000101ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101ED 11908 bytes
SHA-256: 583cf7c25e1873df90bf63ce98334c87c540ba65cba1e170a8d2ed504583f475
font_01_sfnt_off00011e38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E38 18284 bytes
SHA-256: e6ca4e6b2e524552f7fc45636861d3b6ee36b14f8da3ea6fdc641a8f50ba0fca
font_02_sfnt_off00014d7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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