Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bf262d04627a276…

MALICIOUS

PDF

83.8 KB Created: 2021-08-22 07:15:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3e712c809a7ac2a7330767d1d834cd34 SHA-1: 4d32aa4ae5de04ed1bee929f6690319264a654f2 SHA-256: 3bf262d04627a276a5a2731528e28fa074a84ec855eda2cd722fda380764eb77
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with multiple heuristics indicating it's a link farm pointing to compromised websites. The embedded URLs and the PDF structure suggest an attempt to redirect users to malicious content, likely for phishing or further malware delivery. The presence of external URI links and compromised CMS upload links strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://aromamarketing.md/img/files/zozuxokenopuwikezix.pdf In PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/22147917159.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/mudukojifovaxidalexubo.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609f093c384ac---zogijerupemudevupok.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1610faa31ca880---97513634623.pdfIn PDF document text
    • http://markfarolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/75387478790.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/b11b159afb302ab8843f2919f39404ce/19463777403.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077208c9ea97---38924968525.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/e56obtaruidltc3qhh284k2tjr/79448347411.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/sagoxofajamem.pdfIn PDF document text
    • http://app8itebarandgrill.com/admin/images/file/51756532250.pdfIn PDF document text
    • http://lhsclassof68.com/clients/73441/File/sebaluvuxagapor.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/60142153013.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/cnfftmadl7t2qvlcgjvai8v4fh/28224292475.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/xalaxi.pdfIn PDF document text
    • http://intemhathanh.com/img_duhoc/files/81096517492.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/rfvmu38hbls9s0fks63sfirbrn/sopebililawofevar.pdfIn PDF document text
    • https://termoformat.md/img/files/90923218297.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/a4pp8rguamoe78r7v3ctd9mm85/18486848068.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf4e307d76---82394864349.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/97sr9mrf2i6ivsk5l7esjfq5gh/zudukesemitiputudaxuj.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/vosezizijojunilexekebaj.pdfIn PDF document text
    • http://waterlootour.com/FileData/ckfinder/files/20210608_B742B8158184CD35.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/a9fab39f715e4771e411e4d0e66b76b9/96881496598.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=the+great+hanoi+rat+hunt+pdf+downloadPDF 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_off0000e294.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE294 17800 bytes
SHA-256: 0f5c8c52d28a71dc4efb1546539b180981a6fc67e9e7c665b86c206bf1a4a062
font_01_sfnt_off00010fdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FDD 10760 bytes
SHA-256: 18d5bf2cb1eafe3b9c82dec1d704c91f4772746d9ca67d418db5632e86855f4c
font_02_sfnt_off00012860.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12860 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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