Malicious PDF — malware analysis report

Static analysis result for SHA-256 344b0270cd96ea70…

MALICIOUS

PDF

86.9 KB Created: 2021-10-08 12:05:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 237e4781bf19b45352789a85796caa1d SHA-1: edce6d1f4c1adf578a38c4b8bd70baa58390663d SHA-256: 344b0270cd96ea70541805d27b057648369a68ac468ce4fca3b731e94a01866c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://inwebjor.ru/uplcv?utm_term=modern+house+structure PDF link annotation
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ead02233c6---6252104733.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161491fb69e139---metogokategopa.pdfIn PDF document text
    • http://lideparts.com/userfiles/file/1631348122.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615f530940f2d---xofugame.pdfIn PDF document text
    • http://hengtongblower.com/d/files/48694946469.pdfIn PDF document text
    • https://sausalito.com/wysiwygfiles/file/40045630156.pdfIn PDF document text
    • http://regmac.net/userfiles/files/14723275891.pdfIn PDF document text
    • http://sten.kr/club/data/userfiles/file/20210902075030.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/juxajaloparanadumo.pdfIn PDF document text
    • http://www.addvanceo.info/userfiles/files/mavuga.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/dlc9i2564s9jj2cskn7q8d1d8r/99310822750.pdfIn PDF document text
    • http://clinicaveterinariagussago.com/userfiles/files/kivudixilulonipufijumagav.pdfIn PDF document text
    • http://hydrem.ru/images/file/mejujobexiz.pdfIn PDF document text
    • https://eurouniversal.eu/ckfinder/userfiles/files/lopulizosar.pdfIn PDF document text
    • https://o2opr.co/userfiles/files/dujonasevujilumiduwifiwi.pdfIn PDF document text
    • http://wellfoto.cz/pictures/files/poxujofawaruxokuvixax.pdfIn PDF document text
    • http://dataction.org/demo/dataction/media/xixiditugorodugez.pdfIn PDF document text
    • https://skvely-kup.cz/files/file/fowedaxonuzugekux.pdfIn PDF document text
    • https://frigosztufi.ro/ckfinder/userfiles/files/mafuxidizex.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/2191876196159ab1828fdd.pdfIn PDF document text
    • http://w-w.cn/isee/pfm/cms/uploadfile/fck/file/86297261772.pdfIn PDF document text
    • http://hisunnychem.com/upload/files/nebulepovaleme.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/f49ca595436488c959464c8b4559d652/99617598854.pdfIn PDF document text
    • http://denda.co.kr/ckfinder/userfiles/files/womifisagik.pdfIn PDF document text
    • http://turnwealthy.com/ckfinder/userfiles/files/83879615435.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_off0000f10d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF10D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001091f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1091F 17924 bytes
SHA-256: c2a24c5d4d45dd33d3b1b44dab81da7aa65eeb8557073a1ab0d1b9849d6b1c80
font_02_sfnt_off0001372a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1372A 10260 bytes
SHA-256: 4e88fd2025d44435f652b097997b33741f74feef7dc58df61ae527694058260f

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