Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bc0e183600de7e0…

MALICIOUS

PDF

89.1 KB Created: 2021-09-03 00:58:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4e45dcc92664046973974a7a7b53e0a5 SHA-1: 44f52510ec42d6a91087d7a1a6c2929a88306ff4 SHA-256: 4bc0e183600de7e00c189c6180ee12025a62bcf6ab8576776d47d5c22ecd9e2b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many hosted on compromised or disposable domains, suggesting a link farm designed to direct users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, pointing to a tactic of using SEO-optimized link farms on potentially compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://bluetact.com/ckfinder/userfiles/files/galimivibumovi.pdf
    • http://kyanite.tv/userfiles/file/13576409798.pdf
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc113d8cb3d---rolojeratifoxowapu.pdf
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/d59b862257df64031926f0a2e0ba0ca6/34232143340.pdf
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbce178a70---94312065779.pdf
    • http://csc-021.com/userfiles/file/20210815095047_ieidod.pdf
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609a1ba9b62e2---14601335344.pdf
    • http://www.sudaff.com/pics/file/99401764531.pdf
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/26048136009.pdf
    • http://scuderieverdina.it/scuderia/userfiles/file/bekamewukerama.pdf
    • http://vaynhe.com/upload/files/86997770684.pdf
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1611357550b04c---romupuwurixola.pdf
    • https://quatcongnghieput.com/uploads/files/dawoki.pdf
    • http://robalton.es/Albums/images/file///nugafozavosiruneram.pdf
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160965e22a7a7e---35413990634.pdf
    • https://culturasiapamplona.com/guiarte_userfiles/files/13208280588.pdf
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/95ttq48jdm7un8p7of557lvqg7/xefij.pdf
    • https://faceless.me/userfiles/files/65921151997.pdf
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/9f980e69f27714816f322b6a86b8851f/13797277125.pdf
    • https://stpeterscbs.ca/ckfinder/userfiles/files/peguto.pdf
    • http://mbjarrahi.com/UploadedFiles/New/file/34989519759.pdf
    • http://anthonyjcincottalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/1532272455.pdf
    • http://rykatd.com/files/pawanexazunofuzozad.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=sharp+xe-a203+cash+register+instruction+manual
    • 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_off0000f120.bin
a717f83ee545211b43c03f5ba926ab3815bedb2e8fd365c8928dc52a754dceab
pdf-font-stream PDF embedded font (sfnt) at offset 0xF120 19312 bytes
font_01_sfnt_off00012372.bin
ad35a7ec98f1037d6fc8a0f096dde06df3eceda03c411f771202f5eed2620752
pdf-font-stream PDF embedded font (sfnt) at offset 0x12372 11544 bytes
font_02_sfnt_off00013ec5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13EC5 16792 bytes