Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5729a156c1e71f2…

MALICIOUS

PDF

70.3 KB Created: 2021-09-10 09:27:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d9bedd0051b915b9c5b6ec5eb4767701 SHA-1: 220e97ce81dcb7705886a1412b65b667ca9433c3 SHA-256: e5729a156c1e71f2cea666cd93dc0576458dc252334b595ed3a21cef14d7a0cd
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were extracted, the structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://alibabashipping.com/userfiles/file/13584918406.pdf In PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130e8fb5b60b---fufamikifefupusilamabano.pdfIn PDF document text
    • http://prabashproperties.com/ckfinder/userfiles/files/fusife.pdfIn PDF document text
    • https://openkomm.yussfone-crm.com/userfiles/file/kizolusa.pdfIn PDF document text
    • https://ehbo-oostkapelle.nl/userfiles/file/mutasiw.pdfIn PDF document text
    • http://hwayoung.kr/upfile/files/berikorixu.pdfIn PDF document text
    • http://www.elstar.ru/uploads/files/defujegulujasivavi.pdfIn PDF document text
    • http://stroykap.com/application/views/stroykap/userfiles/file/85831926149.pdfIn PDF document text
    • http://hoanhaochemical.com/uploads/files/fejedapuvisimetosotu.pdfIn PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/wopodesameguzagines.pdfIn PDF document text
    • http://eros-arena.de/eros/userfiles/file/nurizasebo.pdfIn PDF document text
    • http://dealershop.es/userfiles/file/17781613530.pdfIn PDF document text
    • http://snap-drone.com/userfiles/file/37049529636.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb95a5f684---54240977342.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/9914860854.pdfIn PDF document text
    • http://odontoflash.eu/userfiles/files/jirexuratise.pdfIn PDF document text
    • http://tutek.eu/userfiles/file/xazuxejofavatapu.pdfIn PDF document text
    • http://scvumaichiramen.com/uploads/files/51722657908.pdfIn PDF document text
    • https://artinterior.bg/userfiles/file/61984611212.pdfIn PDF document text
    • https://ijp2.com/contents/files/kujepola.pdfIn PDF document text
    • http://shophouse.info/images/files/25490970956.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613005bf4515a---17320076707.pdfIn PDF document text
    • http://geo-equipe.it/userfiles/files/sojatalafirub.pdfIn PDF document text
    • https://garnizone.com/userfiles/file/22224924392.pdfIn PDF document text
    • http://maginsaatmetal.com/resimlerfiles/tirivadu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=android+kikaider+episode+1PDF 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_off0000b360.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB360 10368 bytes
SHA-256: bfd3de209120ce5e019a1f6adffb6573b02c01f98de8910a9d2dee92ae12a09d
font_01_sfnt_off0000cae9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAE9 15404 bytes
SHA-256: 1aba74099bdd0c7e61c33b15953f7c2829ecaf0d3eb8740286de49f30a34b363
font_02_sfnt_off0000f1b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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