Malicious PDF — malware analysis report

Static analysis result for SHA-256 258dd273fa652c83…

MALICIOUS

PDF

77.8 KB Created: 2021-09-05 11:18:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2901112e6a3fb36397db84d53609118a SHA-1: 9acc651ed57d5cb7a36bde58594e345f0668176c SHA-256: 258dd273fa652c83790db1f2874353f2a77140622e797dafb526d54bc8f11110
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm or SEO poisoning attack. The presence of multiple PDF files hosted on these sites indicates a potential distribution mechanism for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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 https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160dfdeb164389---82867327378.pdf In PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160cb8adff12f8---duzolaxo.pdfIn PDF document text
    • https://tsegypt.com/file/tukam.pdfIn PDF document text
    • https://yucekalipmakina.com/tsrm1/img/userfiles/file/92116561053.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/64fa0c8ce48ddd57fc54ef3d2f5a95c9/nufutanofumabuzewudama.pdfIn PDF document text
    • http://nceed.kr/pds/userfiles/files/38416776765.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5258d2e5a54d760fdb0fa23f853597e3/31975983366.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/044b595ec47d0a7ba9675fab3484e29d/2223330389.pdfIn PDF document text
    • https://we-plus.tw/ckfinder/userfiles/files/89060896386.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/786e765b8ea270a7016b41c9021308a0/penekanurovesivudasume.pdfIn PDF document text
    • http://helder-effect.nl/userfiles/file/69184767544.pdfIn PDF document text
    • http://papaicountrylodge-longstay.com/user_img/files/3075475551.pdfIn PDF document text
    • http://bloemenwinkelindex.nl/images/uploads/76237834142.pdfIn PDF document text
    • http://sieuthibds.net/images/files/bawokaxinomevimi.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612c47ed8f583---22050566928.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/c9bbd68b9881ef96ba2f1e3084138fe0/34718485549.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/45b64817fe5f63b0ee82f59343c208d9/dikujefowomesaxali.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/16111f65d0eda3---90734336863.pdfIn PDF document text
    • https://rovetco.com/userfiles/file/rosogadogib.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4c6d02325---winigibezevupilulo.pdfIn PDF document text
    • http://dui-antidote.net/images/userfiles/file/86359886550.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/lupisesonimew.pdfIn PDF document text
    • http://ilovemynewstemcells.com/clients/865932/File/nesamudolomexagujeriwaba.pdfIn PDF document text
    • http://daiichigroup.net/uploads/news_file/jividapa.pdfIn PDF document text
    • http://le-bouquet.be/userfiles/files/77705316971.pdfIn PDF document text
    • https://www.dropbox.com/sh/2on55v6mud0mq29/Qw90oDfS8NWhenIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=2000+chrysler+300m+owners+manual+pdfPDF 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_off0000ca4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e261.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE261 11312 bytes
SHA-256: 19406d9f8da086c046c6a7091feb055714171ad4c9351b225e85c098cb017bba
font_02_sfnt_off0000fced.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCED 17128 bytes
SHA-256: 8192ca939f2bfd1d727cf18a7afd8131373626495a1e28c45bf2a9200542f674

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