Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f2910244e566577…

MALICIOUS

PDF

72.8 KB Created: 2021-09-09 10:48:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5facac828674e16bc9a4b72f5c11d4e8 SHA-1: 6bc9a047da6ed1772c3e9d74d5d3763a6d2b41b5 SHA-256: 1f2910244e5665772ed61b0524add74a3ba3dcacec231cf719cba69bef442de6
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the PDF contains a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the nature of the link farm point towards an attempt to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://vencedor.coop/images/admin/file/44868607215.pdf In PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/39854707a890e901d9fdab8ab8aaf4ae/bigaribumozikuwosa.pdfIn PDF document text
    • http://timeyear-v.com/userfiles/file/27828020849.pdfIn PDF document text
    • https://arabadvertise.com/userfiles/files/rotizawekalux.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/vikutovukejilupowadobub.pdfIn PDF document text
    • http://premo.at/userfiles/file/90830050028.pdfIn PDF document text
    • https://butchercurnow.com/img/shop/contents/rinogexubanav.pdfIn PDF document text
    • http://pho32shabu.com/uploads/files/21864027087.pdfIn PDF document text
    • http://zhuoer.ltd/userfiles/file/91991361565.pdfIn PDF document text
    • https://xn--interpeas-r6a.es/upload/files/nowivunafiwesunibopofex.pdfIn PDF document text
    • https://cjsc.se/ckfinder/userfiles/files/68732148262.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133211d9f4b0---76137435036.pdfIn PDF document text
    • http://dichvuhieuchuan.com/upload/files/kinalidoguveporenotilil.pdfIn PDF document text
    • http://palestraarkadia.it/userfiles/files/majozefabevukupe.pdfIn PDF document text
    • http://studiolauramoschini.it/userfiles/files/43250578419.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/6hups4dfv0fhuhigqpkflnhk29/kidajodajabidogomeve.pdfIn PDF document text
    • https://processwork.archerhuang.com/ConImg/files/29216915140.pdfIn PDF document text
    • https://biroestarsa.hu/uploads/file/talovatarexerujuvaragun.pdfIn PDF document text
    • http://newbusan.net/FileData/ckfinder/files/20210909_667EEDAE4350418A.pdfIn PDF document text
    • http://cauthangdep24h.com/upload/files/tabepagavowomenadoti.pdfIn PDF document text
    • http://thegioimercedes.com/upload/files/36279769995.pdfIn PDF document text
    • http://bigyikesmedia.com/home/xtremweb/public_html/consultinstitute/web/upload/files/33349295316.pdfIn PDF document text
    • https://lesartsdansmonjardin.com/userfiles/file/20210904180210.pdfIn PDF document text
    • http://carlaschroyen.com/content_docs/walevepedet.pdfIn PDF document text
    • https://crownprolaw.com/userfiles/Proj_Name/files/16936741890.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=office+365+enterprise+loginPDF 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_off0000bb9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB9C 15760 bytes
SHA-256: b90d714ea113718b6c38b5c03f5eac6a1555c341c90533670054b586de804165
font_01_sfnt_off0000e406.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE406 10992 bytes
SHA-256: e57b8c888e4ae020c3b56b88e759708734d97dfd90f1f7c3d404bda42c46ac65
font_02_sfnt_off0000fdbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDBC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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