Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2d45aeb0ad8d7f8…

MALICIOUS

PDF

73.3 KB Created: 2021-09-04 22:46:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ee8b035e6a0c0dedd112a5b10f7e5055 SHA-1: 8efe6610c526ac3720329a043a47c64c07a5b9dd SHA-256: e2d45aeb0ad8d7f8e5a1470df069f6e45d23972b84897a5ccbde8106d1107cd3
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous URLs pointing to external sites, with several hosted on compromised WordPress installations, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing content but serving as a vessel for these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160961ac420486---pugazivadozekojis.pdf In PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bcb504e5125---9267388444.pdfIn PDF document text
    • http://azizolace.cz/images/file/69553288037.pdfIn PDF document text
    • http://whscardinals1963.com/clients/9/9e/9e5fab02d16e7113a74bdd4e7828f974/File/kuzotusepewaxikeda.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/0cbjmt71gmn2tc4o3n3v2vd386/54562597758.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608efa10b0299---32797036482.pdfIn PDF document text
    • http://detskaoptika.cz/ckfinder/userfiles/files/80502896154.pdfIn PDF document text
    • http://dichvutheapec.com/upload/FCK/file/51929999092.pdfIn PDF document text
    • https://everywheregenes.com/uploadfile/qu26_qu106_com/files/lakel.pdfIn PDF document text
    • https://mygoaltv.org/ipp/images/uploads/files/jorexumixabigojudaro.pdfIn PDF document text
    • http://giasuthienphuc.com/Images_upload/files/difipozasigije.pdfIn PDF document text
    • http://ylphs.com/ckfinder/userfiles/files/38814349403.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/f368b4b0febb6639494f4ec5ad1d2a43/terumu.pdfIn PDF document text
    • http://extracam.es/app/webroot/arxius/file/21455897935.pdfIn PDF document text
    • http://derma-dts.de/files/file/sodisisifa.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/2f1382a02a4f07886bfe87e99f3f03d2/fibanebuzubidegorazu.pdfIn PDF document text
    • https://etimes.mn/uploads/files/najakiniwimijofidupe.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/xaxojop.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/8vs0uv6c05raclbg125rkfm13c/85538165064.pdfIn PDF document text
    • https://cavalier-hundezucht.ch/userfiles/file/zerexonujasojode.pdfIn PDF document text
    • https://ytdrive.com/CKEdit/upload/files/warixuvolakawalipugasugok.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/hujalc767e01f0348b3j40cadt/911602877.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16124d82405ba3---10923585902.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/6cfb8d65bc603b7e3bcf025e68264eb9/60910342755.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=maestro+occupancy+sensing+switch+manualPDF 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_off0000b8aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8AA 11116 bytes
SHA-256: 5ec376bbcc7639f956da7bf8f6ff9814f324e6b2268480f8650b8e0788590e58
font_01_sfnt_off0000d285.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD285 17260 bytes
SHA-256: 229f4d7955092da97f7c09954fad7a22ddaa21d6dcf87b3ed5f82befc244c1fe
font_02_sfnt_off0000ff67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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