Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fffc642e4cdd8fd…

MALICIOUS

PDF

90.1 KB Created: 2021-07-04 11:12:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5d1f04dc30966a44513d9134ba6732d1 SHA-1: 45881457b87af0fbba0cce73e1d676e67489e4be SHA-256: 2fffc642e4cdd8fdd4d1a54ce6841a1facaafc9f828a8e646fccdad4b1e81ff9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised CMS uploads, indicating a link farm designed to distribute further malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document, potentially leveraging embedded JavaScript for exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8564278610---jewepelowusazisopulu.pdf
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/psgb9s8i1t0gp7na2htm8thoqc/nozavuwazokelapofeg.pdf
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a4af3d03a29---xemexoxeve.pdf
    • http://giasuminhtam.com/Images_upload/files/lukiw.pdf
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b01b745371---kelakigoradetum.pdf
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160859cae76678---79551019633.pdf
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/a1d2b8f6fe522e0abf0fc974087a819b/23841577479.pdf
    • http://baikalspring.ru/ckfinder/userfiles/files/kedidifumodu.pdf
    • https://pet-fashion.ro/mm/file/45700290856.pdf
    • http://alkanboya.com/files/file///9748891514.pdf
    • http://aldo-ins.com/userfiles/file/wagedunaxuvu.pdf
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/8e7c2i5r26qor5f9q3r58dmoo5/zewigelulebofusuj.pdf
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/fuxaveleb.pdf
    • https://roweryelectra.eu/app/webroot/uploads/file/16198623925785.pdf
    • http://av-jet.ru/userfiles/file/40564751282.pdf
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/f984b9446de483e4034e1a1a2864061b/36215007037.pdf
    • http://malbreil.com/userfiles/file/xanaliburolurikowoziw.pdf
    • https://tsegypt.com/file/34650322285.pdf
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075d242197c5---44437123724.pdf
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607744917cd08---zonemodolebarunefojogixu.pdf
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/papanewinume.pdf
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb8b828e542---rufuw.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=spanish+articles+exercises
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ebc5d6f334---69183757773.pdf
    • 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_off0000fd19.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD19 16792 bytes
font_01_sfnt_off00011530.bin
1faf38d7b807f126e4e9a260147506d116513e806ca3271c1a9e0bb42c654de9
pdf-font-stream PDF embedded font (sfnt) at offset 0x11530 10528 bytes
font_02_sfnt_off00012d1a.bin
deb315f11283e47bb83c1d11b57103286c748ed8879375f88bae080ea7cf2308
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D1A 17960 bytes