Malicious PDF — malware analysis report

Static analysis result for SHA-256 3501842c7cf4ae22…

MALICIOUS

PDF

96.3 KB Created: 2021-07-17 15:17:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 230b9787ee7756a64017bd90f1204803 SHA-1: 1ea870f1e26a3cb125f56cf3ae64bd7230a975e6 SHA-256: 3501842c7cf4ae226a8ecce677f3f44e25250a9af9b78e41da7a775a5eac383c
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, and heuristics indicate it is a browser extension installation lure. The document contains numerous links to external PDFs hosted on various websites, some of which appear to be compromised CMS uploads. While no scripts were explicitly extracted, the nature of the lure suggests potential for JavaScript execution or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://acgroupenterprise.com/userfiles/file/63055905809.pdf In PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/fj56lk55f4nvjs1026eu3vaftu/regizugad.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/160865c8b60385---kijoliki.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606ffc2b57ae1---pelinuxapijepizadufu.pdfIn PDF document text
    • https://cfacgroup.com/uploads/FCK_files/file/zepekaxazuwavu.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a4ssvue6sd0ug03k9bo77vhja4/pelelativutipibadexofi.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16099578447524---87707288644.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609f38e24e5e8---75114001342.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160e08df0459ee---bisox.pdfIn PDF document text
    • http://fitviewer.biz/files/file/33405257473.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/f4d6vjfquqkhoi7ld8vikb8eo6/folubaxopusix.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/617b22a7968bd694f7d2f6c62359e3b8/zuzivawafarezevotave.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/2ba44a1bab5f3c7dee8b7c34d06bd588/zabegewogikaranamat.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/90738371410.pdfIn PDF document text
    • http://fontanarosaserigrafia.it/userfiles/file/pemubixobepi.pdfIn PDF document text
    • http://joyearland.com/ckfinder/userfiles/files/89581474922.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a91d70605---rinepakoremeniwige.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/d392d39746a24a2d1fcfa483839ef8e7/60930750257.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/e7a152119fe17ce431243ba3026b6c61/35241510823.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/naludubibadowagizoni.pdfIn PDF document text
    • https://inncredel.com/uploads/ragomujumugo.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d90df4025---tijabumixabebupu.pdfIn PDF document text
    • http://stphilomenaonline.org/userfiles/file/komevodixupafulisamikexet.pdfIn PDF document text
    • http://alumcity.ru/userfiles/file/47844855073.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=open+pdf+in+android+chrome+browserPDF 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_off0001103b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1103B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001284d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1284D 18476 bytes
SHA-256: 805769b2564dcbbd8b70bb5a8a789c8e697f4fc7eeb4e845ab5deb70ba7c9f4e
font_02_sfnt_off00015921.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15921 10992 bytes
SHA-256: 59d616b923833f527b7378dd85aed0f687d130059d9c910b5910241bfb954279

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