Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9842b1a5b3c7965…

MALICIOUS

PDF

206.9 KB Created: 2021-07-14 05:30:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 9cc093a44eb9aa5bf4dc0f94a36b6f7e SHA-1: 37389ac4f832ac2c83fa84f0687cc97620f6bd54 SHA-256: a9842b1a5b3c7965275d4338bac2033e8a14a4f9a6cd1dd65a38e1d6eaec7806
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links pointing to compromised WordPress sites, acting as a lure for free downloads. The high-confidence ML classifier and ClamAV detection indicate malicious intent, likely to deliver a phishing payload or other malware. The embedded URLs suggest a phishing campaign disguised as a free download offer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9819

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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.
  • 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://chcial.ru/uplcv?utm_term=nutrition+an+applied+approach+4th+edition+pdf PDF link annotation
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/3c9ebbe89e04f13a1fd3a4be09798c12/bigetuxezifazefipuz.pdfIn PDF document text
    • http://aimecostruzioni.it/userfiles/files/97739507231.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/solodebulimuwojopatet.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160ad810b81f94---dilamufofoni.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aac4f84e827---paxokozoxufefelefeko.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/91m8qvd8ojbaods7itv1561apa/89831811579.pdfIn PDF document text
    • http://suseefinance.com/userfiles/file/77917450650.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/7e0178a5f6cd199840c3dd5c01204259/69231001470.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/5547c31156b5e12bfe88b5d2d3ecaddb/terenis.pdfIn PDF document text
    • http://quanhoangtsi.com/upload/quangtri/files/65485984153.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c51098a11a7---6838517652.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/3f94hma253qm3e125uqtudbue2/59917190178.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/90250553929.pdfIn PDF document text
    • http://dashoernerboot.de/userfiles/15299433709.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/dum0gjn5p1bj3trgakt5em58fo/46497959960.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/najerirusimel.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160e1ebd5cff96---5914373330.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/bnrfgro0i02kbanee43s166kf3/pelutakatit.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607d59151e152---zawukeli.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/womanafajetobokedup.pdfIn PDF document text
    • https://ce-mi.pl/uploads/userfiles/files/vatutigibevarus.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160adeea35cd70---80758516356.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608c6d8214e9e---53506892697.pdfIn PDF document text
    • https://laser123.com/geektic/files/fiwikepexazilema.pdfIn PDF document text
    • 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_off0002cca4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2CCA4 18100 bytes
SHA-256: 8e883a71bf01d8919cc6ce0a281eae1c2a66068c805a1e1a414a5962960c7958
font_01_sfnt_off0002fcb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FCB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000314d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x314D0 10704 bytes
SHA-256: b30c98f22721fd76452c90b218c433566a07ae4545d8bfd766ebe0350a46a932