Malicious PDF — malware analysis report

Static analysis result for SHA-256 4979ddcefd7fcce5…

MALICIOUS

PDF

82.6 KB Created: 2021-09-06 18:54:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d7c01853d898cc3de883ec3c900c6c32 SHA-1: 4c1f83f91cdfa0ce4a77dc8e59a2d594adc63027 SHA-256: 4979ddcefd7fcce560f243529428deaddf054c8ad81090d2b68e6ab19a1caad5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The presence of numerous links pointing to compromised WordPress upload directories and disposable hosting suggests a link farm designed to obscure the ultimate destination of the user. No scripts were extracted, but the overall structure and heuristic firings indicate a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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
  • 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://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca31d0354a---rufokafojoke.pdf
    • https://cristalensi.com/public/File/53700698615.pdf
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1609883fe240ce---94195355937.pdf
    • http://codemessaging.net/ckfinder/userfiles/files/49267756436.pdf
    • http://grafosaleservice.cz/images/fck_editor/file/92424769017.pdf
    • https://thefertilizergranulator.com/d/files/vakomugetokuke.pdf
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/gk0lrrlac3privqo37m2mjhrl0/48268752204.pdf
    • http://tuzvedo.hu/elemek/file/zoxavusenuxawoxosodigo.pdf
    • http://mh-gartengestaltung.de/userfiles/file/bulilasux.pdf
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfbc3406077---tukebafowaju.pdf
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607040974f248---labega.pdf
    • http://icltindia.in/userfiles/file/671449318.pdf
    • http://abwingssuffolk1.com/uploads/files/luxijigerodotejopipason.pdf
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/1cbc66627624def756c39d412f168fbc/28245828540.pdf
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/d30a29866e069c62eeb2b0bebc78da79/faxoduf.pdf
    • http://omonetach.pl/foto/ilustracje/file/26279842702.pdf
    • https://nacionalequipamentos.com/ckeditor/uploads/files/91487217358.pdf
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b56a4baa346---pesuwupaw.pdf
    • https://mosallaesf.ir/uploads/ck/files/38096113194.pdf
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608756976a904---36544573132.pdf
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa0f9ae5c98---63052482999.pdf
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/fqr273ovn5aloja0n96hbtlgbj/xarijirikaxuzugi.pdf
    • http://mebizstekla.ru/userfiles/file/daxoxuvidokumedosoji.pdf
    • https://wrd13.com/force/file/diduravikolasefalodaruta.pdf
    • http://technoculture.cz/admin/upload/file/jijijedisoroxegiviribexet.pdf
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160984b686179d---9427479865.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=discrete+mathematics+project+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_off0000dd72.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD72 16792 bytes
font_01_sfnt_off0000f584.bin
aa083ef1e3b862877b4f323662fa946dcb7705c9e2f21e837d85d76c41ec6590
pdf-font-stream PDF embedded font (sfnt) at offset 0xF584 17476 bytes
font_02_sfnt_off000122f2.bin
b1f8dba976f3bb67c6f54e4da0cc60b451ab17ec95d3ac329deeb8080f29f644
pdf-font-stream PDF embedded font (sfnt) at offset 0x122F2 10864 bytes