Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e4dc31b6e7ed739…

MALICIOUS

PDF

323.9 KB Created: 2021-07-01 19:09:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: a9eab5c51d02da3ce329f8575059695b SHA-1: 755599b16ac480353575269d83877ae3bce4a3f4 SHA-256: 1e4dc31b6e7ed739dceb525166d71857506851073db283783e0b64130a8a39ac
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by ClamAV and ML classifiers, exhibiting characteristics of a phishing lure. It contains multiple links pointing to compromised WordPress sites and SEO redirectors, likely intended to lead users to malicious content or downloads. The heuristic 'SE_CALLBACK_LURE' suggests a potential callback phishing or tech-support scam pretext, although the document body itself is heavily obfuscated and does not provide explicit textual lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9866

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) or Microsoft license-boilerplate documents that carry no urgency or charge/dispute escalation.
  • 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://huntic.ru/uplcv?utm_term=four+letter+words+with+one+vowel PDF link annotation
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf37bd1438---90599262103.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/eo27iuacv2j3nis2oltpa76qnt/62114005088.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a05535897d---mikajezekotep.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160759234d560a---bekatufejanuma.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6b48cd2b3---61119111555.pdfIn PDF document text
    • https://thieumaunao.vn/workspace/develop/uploads/ck_upload/files/dubinisavosopudavufasid.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/2pfmjf9u55lbnvi4jl2bl7h9n5/32515034531.pdfIn PDF document text
    • http://beiks.info/public/file/zofexizitib.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/1560d48f63b91abf5648971490a4532a/66486825803.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/0da12774f9331e212450b147a1c686ff/sapurifoxise.pdfIn PDF document text
    • http://starwindows.ie/ckfinder/userfiles/files/71390285020.pdfIn PDF document text
    • https://washlounge.in/ckfinder/userfiles/files/65669411763.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/ffede682f7a1f2c6dc63da5ca0a44318/temosafesefetal.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160716c2ceea80---punupukuromuzenofaw.pdfIn PDF document text
    • http://bkdesign.ee/userfiles/file/lolopajakasidoseba.pdfIn PDF document text
    • https://motiv8workout.com/up/files/xonolabena.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/files/8662925311.pdfIn PDF document text
    • http://sunnysidehighschoolclassof59.com/clients/867562/File/dadazipebiziwimiviji.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/0l2v9dimv2rokf7ghplna66mu2/vurut.pdfIn PDF document text
    • http://franzoesischebulldoggen.eu/userfiles/file/24986838858.pdfIn PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/wufipimedalotibuvetox.pdfIn PDF document text
    • https://gastrotest.co/ckfinder/userfiles/files/60075410897.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000475a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x475A3 16436 bytes
SHA-256: 228f940bfe5bb7136f960b009e051c58fd15f2a67829da8e9d39d9ed442f2544
font_01_sfnt_off00048c61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x48C61 10412 bytes
SHA-256: 785cb5a28ecf3555574a08cd11ff67f72d545c94cbb5f6b8a62512c8e2eacea4
font_02_sfnt_off0004a3eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4A3EB 26576 bytes
SHA-256: 19ff97887f9cce50a619daf47fb07add21ec6b21ca450fcb9ec9e21d8e8df178
font_03_sfnt_off0004e8c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4E8C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1