Malicious PDF — malware analysis report

Static analysis result for SHA-256 c80afc625349f3b7…

MALICIOUS

PDF

89.8 KB Created: 2021-06-25 15:02:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 3f512ba9c5db5553ac956dda2c7db924 SHA-1: 7d4c689b18e965013a13f76f39555be45fa5bddc SHA-256: c80afc625349f3b7ae09d1fa8dcae5cd11d093f1e9bff7dc844c4f7a78f5de71
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The heuristics indicate the document functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting. While no scripts were explicitly extracted, the nature of the PDF and the presence of embedded URLs suggest it is designed to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/9ce850d743c6e65989827846cfff5c1f/3257373708.pdf In PDF document text
    • https://calmoinc.com/upload/editor/file/64122193352.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/19f51ccb03173f1b216d3b96b2ff103a/74651362049.pdfIn PDF document text
    • https://renfrewareahealthvillage.ca/ckfinder/userfiles/files/35771651034.pdfIn PDF document text
    • https://hashtag.school/userfiles/file/rokabufilugomekafisu.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/files/4850253747.pdfIn PDF document text
    • https://solidpractise.com/files/userfiles/file/45085303494.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b28b061914e---43651029185.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b773c3c5951---lipafapuwes.pdfIn PDF document text
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/39975384587.pdfIn PDF document text
    • https://isosklo.cz./uploads/57790635388.pdfIn PDF document text
    • https://boumqueur-edition.com/upload/fckeditor/file/41891529097.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608bf19b3562f---85799858392.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/d6e06b6b3e9aa437a108bcd29e95463a/37237236327.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=grey+and+white+chow+chowPDF 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_off0000fd3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD3F 17612 bytes
SHA-256: f1671ddc09f7b3fbf94b62e5b4f7dc6ee0a2614a7443fb82ed2e13a7723a1a01
font_01_sfnt_off00012b33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B33 10492 bytes
SHA-256: 459f92967dd2682978ccacc34030bbf1242712e002af384400c2f29df8f9a145
font_02_sfnt_off00014313.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14313 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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