Malicious PDF — malware analysis report

Static analysis result for SHA-256 67535a570c898e6d…

MALICIOUS

PDF

81.5 KB Created: 2021-08-29 16:15:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 843c1665984bcb24c972a03aeeecab23 SHA-1: 84e1a511c690d7a080dd763b1445f6bf0ae462be SHA-256: 67535a570c898e6d3141bf1496742d8b8b1f7f1228940358517e06d6c4c21f09
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Numerous heuristics indicate the document contains a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. While no scripts were directly extracted, the PDF structure and embedded URIs strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://amirafouad.com/uploaded_files/file/25700317212.pdf
    • http://www.vandiestbrandstoffen.be/uploads/files/texufezada.pdf
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161263430badf9---41255384770.pdf
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160c452a507317---42034776459.pdf
    • http://jpcadonate.com/clients/4/48/4863a0bac697dd4b44f4a1b1fb44835f/File/615544385.pdf
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/adae74c33abbd9cded1b47d553b81c9d/17442703395.pdf
    • https://philly.drinkpoint.com/uploads/files/sijaranininofujux.pdf
    • https://inijariku.com/ckfinder/userfiles/files/2367439396.pdf
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/5ccc276a670445d6b90a26ba61873356/2239242598.pdf
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/25e512741f8bfe6dffb64e53d4b23114/18995180401.pdf
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/0d432d8d697cee712434edf65924415d/gigenu.pdf
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/299523c859a076b2b8a8c65660be53c5/81913673288.pdf
    • http://xn--b1adcbbai1bezln.xn--p1ai/content/File/30527051237.pdf
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160afdfc2672c4---11773599778.pdf
    • http://arablift.net/userfiles/file/nuvavelavibogud.pdf
    • https://pk-kuepfer.ch/ckfinder/userfiles/files/96828633231.pdf
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/87tis9p182v4j00ounaid2lbh0/silezuxisifa.pdf
    • https://gmnavarra.es/ckeditor/files/12252617226.pdf
    • http://abwnickersonplaza.com/uploads/files/43790118322.pdf
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c1912b7beb9---pelamoxiwow.pdf
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c93fa453266---nudokegeniko.pdf
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/d80683bf8f4f6022fb469801e80d4724/16981882350.pdf
    • https://congchungnguyenlieu.com/uploads/files/18031690844.pdf
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160afe0dde7b74---95373241627.pdf
    • http://foxgraphics.paulsfashion.in/files/kavejozuwenidi.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=the+godfather+love+theme+piano
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5df.bin
f9583117e4c5366d23cb5c557999b5f75d79c4bf574e73a9160b88286ff36df8
pdf-font-stream PDF embedded font (sfnt) at offset 0xD5DF 10808 bytes
font_01_sfnt_off0000ee62.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE62 16792 bytes
font_02_sfnt_off00010674.bin
f4cb181b7bae34018b3a6e517bb333edf3d58784f4914730ca02a64653b1b0aa
pdf-font-stream PDF embedded font (sfnt) at offset 0x10674 18788 bytes