Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f1fc38f25d2c9bd…

MALICIOUS

PDF

86.9 KB Created: 2021-08-08 07:28:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c18677daf21093e509e8f268f28fa94e SHA-1: 547b75735ed09fbab307a0f0b5b32c798bdcfa44 SHA-256: 4f1fc38f25d2c9bdcaceba8be667192240602f4ac650c21253e06443d88d3ed7
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains numerous links to external websites, many hosted on compromised WordPress installations or disposable domains, suggesting an attempt to distribute further malicious content or phish for information. The presence of PDF_URI and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a link farm strategy, likely to obscure the ultimate destination of the malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://crewmak.ru/uplcv?utm_term=best+app+for+direction+compass PDF link annotation
    • https://weeb.nu/userfiles/file/dinitirunib.pdfIn PDF document text
    • http://joyearland.com/ckfinder/userfiles/files/fabof.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a629e7a169---wikev.pdfIn PDF document text
    • http://vp-dmsh.ru/admin/ckfinder/userfiles/files/4149588538.pdfIn PDF document text
    • https://33mobility.net/uploads/files/zekozasedojowofer.pdfIn PDF document text
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/44503392456.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16095cea0e11a0---zigujubowologalafo.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/b1c06921aaaed5b899d24fbb05fbc039/21556650667.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/83bf740a2d250f058773e7448af63ce8/rixijiketijopuludade.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609780e307e52---80972924961.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/2dd4ff1e2610d36e1d4915ab7d6b9c78/54055515567.pdfIn PDF document text
    • http://koryosushi.com/uploads/files/53732825657.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/9e80b15a341afe1d6f6c9ee4ffd04081/44952840703.pdfIn PDF document text
    • http://myconnect-thailand.com/image/upload/File/89260947788.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/b08e80dcf9159e56ada935fb2aadf7c5/xalonikoluzarekuguwo.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6c7741bc89---98985623319.pdfPDF link annotation
    • http://geniuschulatutor.com/userfiles/files/95751018391.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/bda9b9d26acea8395a4914afa56ba947/44928323832.pdfIn PDF document text
    • http://nccutrackandfieldalumniandfriends.com/clients/2/2c/2cea5a7e730406ee40dfbbde6098010c/File/10295103648.pdfIn PDF document text
    • https://internationalmedia.com/userfiles/file/58001470691.pdfIn PDF document text
    • http://marcelponjee.nl/ponjeefiles/file/soguke.pdfIn PDF document text
    • https://absolut-fit-and-dance.de/wp-content/plugins/super-forms/uploads/php/files/jh56l18avb3djq20fkau0msovf/4903853135.pdfIn PDF document text
    • https://rcot.org/userfiles/file/35755667911.pdfIn PDF document text
    • http://budoprojekt.eu/obrazy/file/66373451649.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_off0000f000.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF000 17064 bytes
SHA-256: e58e3aed2c88bb6f5019ae681b826e2778b40f4a318f4d1b517624bfc36e11b4
font_01_sfnt_off00011cc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000134d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134D8 10788 bytes
SHA-256: d9d4154dfb135bbdb597d6ffc44b65b7318dee80ef5f190a83fdcc6622a70480

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