Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab7657b615949fa1…

MALICIOUS

PDF

68.6 KB Created: 2021-10-04 09:07:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: cd8544defff8b3fe2280d7ab31345bc0 SHA-1: 6600e89fb18704c07e35f34c1dbd0c7508a0cf70 SHA-256: ab7657b615949fa1c37a97cbb8df3b94adbf438ba8e37e20450b3383194a6353
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed for malicious redirection. The ClamAV detection and ML classifier strongly suggest a phishing or malware distribution intent. No scripts were extracted, but the primary attack pattern involves luring users through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://chcial.ru/uplcv?utm_term=green+card+and+citizenship PDF link annotation
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614fc24f42de3---41561591689.pdfIn PDF document text
    • https://what.whatproperty.ng/ckfinder/userfiles/files/xizalejavimo.pdfIn PDF document text
    • http://dispensapertutti.com/userfiles/files/22633937870.pdfIn PDF document text
    • http://dochoiotovn.com/uploads/userfiles/file/72943850651.pdfIn PDF document text
    • http://bibikid.ru/upload/ribadusojit.pdfIn PDF document text
    • https://casaalu.com/luutru/files/79882819707.pdfIn PDF document text
    • http://radecznica.pl/userfiles/file/85880118176.pdfIn PDF document text
    • https://ndmoyun.com/calisma2/files/uploads/gakominedatojobenisetilo.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/b9ksdi9h3jacusd3pmqirvju77/53717771966.pdfIn PDF document text
    • http://gartenmessebau.de/uploads/files/54664870399.pdfIn PDF document text
    • http://biznesfishki.ru/files/userfiles/files/56212585770.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb33c5c3c3---safufigajewuxisikoxagifi.pdfIn PDF document text
    • https://tahuacoop.com/cms_gpadmin2015/sgi_userfiles/userfiles/files/sepekuwuziwaponobaxuxi.pdfIn PDF document text
    • http://klick-tipp.at/ckfinder/userfiles/publics/files/lamesotofofojuw.pdfIn PDF document text
    • http://zoscm.zohukum.com/ckfinder/userfiles/files/53475586328.pdfIn PDF document text
    • https://marbeyoyun.com/calisma2/files/uploads/59589621054.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/39a890aa5f4b5489cb7e1583fa26fe0e/rinavigum.pdfIn PDF document text
    • http://jeykrishnaclub.com/images/file/samuzezukibizananojavosi.pdfIn PDF document text
    • https://kibledergisi.net/resimler/files/5712711241.pdfIn PDF document text
    • http://tentimesneedlehill.com/UPFILE/userfiles/files/39564651151.pdfIn PDF document text
    • https://indiachristian.org/uploads/files/93869913579.pdfIn PDF document text
    • http://incomingmakedonia.com/files/files/sodavagikukenazuwupapug.pdfIn PDF document text
    • https://ls-machinery.com/uploadpic/files/202109180019524497.pdfIn PDF document text
    • https://hohsingfiber.com/ufiles/files/63545814296.pdfIn PDF document text
    • 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_off0000aff2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFF2 14876 bytes
SHA-256: cecaeebee1426a804e6e129b345cc2de34374068384cc2448b49fbe2ded3b35e
font_01_sfnt_off0000d52e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD52E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED45 10544 bytes
SHA-256: 588a5b34b06b2a6a8012f73170016d3196e23983d2a3f98a3fb763853f52e044