Malicious PDF — malware analysis report

Static analysis result for SHA-256 901c27e20a0d2ebe…

MALICIOUS

PDF

76.4 KB Created: 2021-06-28 15:58:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e48f38896ca9b985cef590aa78187cf9 SHA-1: c886d87333262da38575b554138db74c6506fd5a SHA-256: 901c27e20a0d2ebec7908d8ffc3603d5dcdff6c4010a4c799e313eb419674207
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file 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 appear to be hosted on compromised CMS platforms, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a566178db91---24473713412.pdf
    • http://fontanarosaserigrafia.it/userfiles/file/71256265945.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/p0c8u77llb7a73jcpt08r41lf1/dekizewamawowija.pdf
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a094dfc0c6f---36154567515.pdf
    • https://classconnbio.com/img-jacson/files/56701744961.pdf
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2ff433d5d5---57224888417.pdf
    • https://summit-christian-academy.com/scauserfiles/files/fovogaramegikinenadabexu.pdf
    • http://eko-inwest.eu/upload/file/wumiwojebifuwulu.pdf
    • http://archinfo.ru/uploads/file/garafevubuxukiletozinul.pdf
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/019rqjj3bce81cusfk9r7fb9i0/13407852283.pdf
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16082a06174a1f---44043114610.pdf
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/4350134d4a6712a1782af60c47b61f6b/sufifaxeribaxopusubidej.pdf
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/bd93dcc6278ec8f1a198c97c75a5435d/livukogimesoda.pdf
    • http://akgikorea.com/file_upload/fck_upfile/file/73951939759.pdf
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/5dj22ff87ab48k2lqldbp4q7l3/26451097616.pdf
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094be59c86a7---87697806648.pdf
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9cf31f362f---jufeguwi.pdf
    • http://ibconsulting.it/userfiles/files/pizujofuzilogumarig.pdf
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607823556f694---vapepal.pdf
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/8cdejbcbtpcg6875hs21lmh753/xexenuli.pdf
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a13ed5cf35b---muzalamajatim.pdf
    • https://powermailer.in/userfiles/file/lokorufebotexulug.pdf
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2da62f0ed---sumubetonewukejitixojuv.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=personal+account+disabled
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca96.bin
28453bf2c2e1d6626a6cd228de50c0612b5c4104f28a213cfd434c24f178557d
pdf-font-stream PDF embedded font (sfnt) at offset 0xCA96 10604 bytes
font_01_sfnt_off0000e2f7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F7 16792 bytes
font_02_sfnt_off0000fb09.bin
b1fd4492429baa8dbce766f5d98283f7e5241d364d950614b098aba921ef5139
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB09 16112 bytes