Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cb2a8a06bdf9bae…

MALICIOUS

PDF

93.5 KB Created: 2021-07-26 03:51:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 297e64977fd43b7cc2fc711f6b7e59dd SHA-1: 85a14c4c591ed88e8ffc7bba2ba84649a4465f78 SHA-256: 4cb2a8a06bdf9bae0b6a8ae1fc66b336e644d8607fb31e8a0a09afe3c7ac0e76
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting it functions as a link farm to distribute further malicious content or phish users. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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 http://houstontca.org/Content/uploads/files/vofaf.pdf In PDF document text
    • https://rcvizovice.cz/ckfinder/userfiles/files/potunelasupetak.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/539bb02998f75d906c83a1b85dc5e6c3/lasujurojuluta.pdfIn PDF document text
    • https://serpavenger.com/ckfinder/userfiles/files/81772150181.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5e31387e99---xomowonewunekijezezad.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/88653085962.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/16084f5368d0df---milonofime.pdfIn PDF document text
    • https://iveducentar.com/uploads/assets/file/86654138275.pdfIn PDF document text
    • http://frutapac.com/ckfinder/userfiles/files/ledidala.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/7c165b54d0a8c2f92dc5f101f4ae78e5/84156791846.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/20314933087.pdfIn PDF document text
    • http://hoteldazegliotorino.com/userfiles/files/nibaritufutosiwijatelum.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/70a3bcaa949a0c3b7eaf05d7671f0222.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/80fc1634b73868631660e3a658da3f83/60283109763.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/chp1n2ejsjjjfhit6237p5abc5/94470143981.pdfIn PDF document text
    • http://emilygrilltogo.com/uploads/files/sudufovo.pdfIn PDF document text
    • http://didula.com/img/file/21041277476.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/c7nsi30gllmi2hmpu28qdh53l3/54064251818.pdfIn PDF document text
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/65107632189.pdfIn PDF document text
    • http://xn--e42bt3l.net/upfile/files/50532381804.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160803443dd01f---gezozekisafalusajaxaxuj.pdfIn PDF document text
    • http://biaikatolikus.hu/files/file/sezonirapemuvizuvoxap.pdfIn PDF document text
    • https://dm288.com/slicice/file/18544519925.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=exercice+maternelle+moyen+section+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE1C 16312 bytes
SHA-256: 7d15b2d6d265aaca51dda18faee70a1b8fa9d95ed54cb111fb0895789092f9ae
font_01_sfnt_off00010427.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10427 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C3E 10980 bytes
SHA-256: 3a1670daace465d350096c5f9f602aa126cba7ba4b9dee5799b87687270c194c
font_03_sfnt_off000135bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135BF 19076 bytes
SHA-256: 5c87928fb2c9b35dfdf66d5da5f9fa71a2af91b4560136160a34354cde96aec0

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