Malicious PDF — malware analysis report

Static analysis result for SHA-256 27aebe67563a6c90…

MALICIOUS

PDF

86.7 KB Created: 2021-09-05 12:15:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9db66cc3bd13f8ee6588bb3b6b91fa83 SHA-1: 636d0363deb54bcb3df877f2a9204e0149e51cab SHA-256: 27aebe67563a6c90d8a8f4a7a96dc9a27c6227b6659495c64454123f98b230cf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many of which are hosted on compromised WordPress sites, suggesting a link farm or redirection scheme. The presence of ClamAV detection and ML classification strongly indicates malicious intent, likely to distribute further malware or phishing content. The document body is heavily obfuscated and unreadable, but the heuristics point to a phishing or malware distribution attempt using compromised web infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/6mathoc1fd2inf1lu418140b6d/mewutig.pdf In PDF document text
    • https://cordovajewelry.com/images/file/5895497611.pdfIn PDF document text
    • https://www.sensiblemachines.com/ckfinder/core/connector/php/files/24995418745.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160878d457a83f---polew.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16084630a7ec14---bebufebeze.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/h3stpld4a0asrj87jdllgr1jig/66957838573.pdfIn PDF document text
    • https://oglethorpeclub.org/~oglethor/UserFiles/file/21237240701.pdfIn PDF document text
    • http://orkoien.com/userfiles/files/jolutavotavonobutaj.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/josugexavuxufibi.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/v9j8514uaef1a4uua8sf1h4534/mosujom.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/wejow.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/71933039616.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a56020cca66---68070423969.pdfIn PDF document text
    • http://studiopetrilli.it/userfiles/files/delabumowarogup.pdfIn PDF document text
    • http://farmaciacogliate.it/userfiles/files/nizigelo.pdfIn PDF document text
    • http://handgun.ee/media/file/pufamofeva.pdfIn PDF document text
    • http://candientu24h.vn/webroot/img/files/bewafavelox.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084e3ba85aa7---kuxinekonopokilol.pdfIn PDF document text
    • https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/7401d283efa547e9d890b35028db00a5/8204789334.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160de8e775fa9d---77149250146.pdfIn PDF document text
    • http://xn--80aaa1acmiejxr6d7fg.xn--p1ai/data/files/motadixuz.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160947ad4382e5---rizukokogisogok.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160d777214735c---60538078987.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/bb72e0339c945e72d1b2f0bad2a446a1/gidinuxasolavezof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=business+plan+template+free+download+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_off0000efd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD7 10900 bytes
SHA-256: b2186fcd7dad3b32b8a46a7fa8fea416c0fcf91ff950a8348d4db2947b2c4471
font_01_sfnt_off0001091a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1091A 17172 bytes
SHA-256: 8ca27f56f5b47ffb6fdb23213bb0a2e350fdb00166e804e23168a92bed3515c8
font_02_sfnt_off00013543.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13543 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1