Malicious PDF — malware analysis report

Static analysis result for SHA-256 9142c2452a2eff96…

MALICIOUS

PDF

70.2 KB Created: 2021-09-28 05:58:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 0f4286a951dd38f448de681e82c9a09f SHA-1: 0fc8c718bba88001ed37596b32e0160da350caa1 SHA-256: 9142c2452a2eff963f42a2f34c39d4e42331ab7a3a40cb82bf75157ccdb6bbf7
156 Risk Score

Malware Insights

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

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to various compromised websites and disposable hosting, likely intended to redirect users to phishing or malware sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a non-clustered link farm on disposable hosting, and the PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristic shows links pointing to compromised WordPress upload storage. No scripts were extracted, but the presence of numerous URLs suggests a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://austarpharma.austarchina.com/upload/files/kaxuwolularojumerafi.pdf In PDF document text
    • http://lgassociates.in/uploads/dotavopiligu.pdfIn PDF document text
    • http://michelesherrinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/19407960637.pdfIn PDF document text
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rurabavepepepiloxekelisuk.pdfIn PDF document text
    • http://architettosbaffo.com/userfiles/files/dujarorezodefiluk.pdfIn PDF document text
    • https://greenboo.vn/uploads/files/vumunumoz.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161430437c9369---nigijil.pdfIn PDF document text
    • http://honghuibio.com/d/files/xodunadadefomivusus.pdfIn PDF document text
    • https://leonardscopysystems.com/home/leonards/public_html/ckfinder/userfiles/files/nozuwufikabixowobilaj.pdfIn PDF document text
    • http://whatdwellswithin.com/file/kileruxezuvotiwixoworepum.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/61b73443fea42919b043eb7228596cea/movesefurelalevigi.pdfIn PDF document text
    • https://solelane.com/ckfinder/userfiles/files/jejexowabodudufijawuzaz.pdfIn PDF document text
    • http://prosquash.by/data/60046676985.pdfIn PDF document text
    • https://maxflowfans.com/userfiles/file/20638079299.pdfIn PDF document text
    • https://texigo.tw/upfile/files/2021/09/10/sajexakolawofejam.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/20f37fb7137ba45fc6131443b05ff777/15093836266.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/b5f966a679e79cf01321c96ce57491ea/41430011282.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/dufosibijanuzokajagu.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614ca693d0c3f---dimipirivuwupelubod.pdfIn PDF document text
    • http://kooijobs.in/ckfinder/userfiles/files/83191460543.pdfIn PDF document text
    • http://ferien-in-zahren.de/images/file/zokaditusamufutolafer.pdfIn PDF document text
    • http://oldstat.ww.tj/img/file/24654666099.pdfIn PDF document text
    • http://strandedtattoo.info/file/lopapivejefe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=uc+hack+2021PDF 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_off0000b186.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB186 9860 bytes
SHA-256: 2c1cb1a12926f657bf220bfc310557a3c3d25de0c6411091280f17652dd1ee2e
font_01_sfnt_off0000c771.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC771 17300 bytes
SHA-256: 0648620db00b28e17f206ac9a07159094418ef55d87bce42c870e732fac928ec
font_02_sfnt_off0000f3c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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