Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f7ba16354f03ac2…

MALICIOUS

PDF

75.1 KB Created: 2021-07-29 21:47:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b045104855a47fdb6cf0d39768478725 SHA-1: daf071564fcd12e4b058a466d680536a3f1bde46 SHA-256: 2f7ba16354f03ac23d676e42bdd4b525b7f5eee4e3630ed452d55ae00411157a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous URLs, many of which point to compromised WordPress sites, suggesting a link farm designed to distribute malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a non-clustered link farm on disposable hosting, further supporting the malicious intent. No scripts were extracted, but the presence of external URIs and the link farm structure are strong indicators of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160759585a93f0---kuduwefaxokuwitog.pdf In PDF document text
    • http://bogelaipigeon.com/upload/file/ruxot.pdfIn PDF document text
    • http://ingmontagna.com/userfiles/files/82817582874.pdfIn PDF document text
    • http://prota.ru/upload/files/levazemetunonige.pdfIn PDF document text
    • http://hccc252.ca/clients/e/e4/e484b38507f190a955b66748903449e1/File/fejojo.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/0284f5jg6mkos5r79338e2m1ps/39297979053.pdfIn PDF document text
    • http://byecook.com/ckupload/files/mulekopisukizis.pdfIn PDF document text
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160852fde9235f---zesavevorimeto.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/a78b9c2d087333f95144bece0c7ea5e2/momajikerafomisazutupa.pdfIn PDF document text
    • http://forumts.com/ckfinder/userfiles/files/muzukulokig.pdfIn PDF document text
    • https://immo-cjeanpaul.lu/userfiles/files/61740309357.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/7ec5c891fd9ac70e01b753382b811096/duvegededezejudot.pdfIn PDF document text
    • http://centrostudiapulia.it/files/files/lexeresejajejulafi.pdfIn PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/36897959030.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/eabd1d33c20662d059acd43cbbd62c2f/28203551444.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/kebukoromudevigazeno.pdfIn PDF document text
    • http://drkoopman.nl/cmsimages/file/87411844333.pdfIn PDF document text
    • http://facyt.com.ar/ckfinder/userfiles/files/6238779471.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/30366906067.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/9a3dc7d49a6b81ef452383fa1e12c728/divotepasobu.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/pulabuxaz.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9fa6d4b92f---ragogavipavovap.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acc96936564---25404639968.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160728c2519c29---tofole.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/25v5q7c3f11qvr50s1tn7g5aq1/kenosedafo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+play+junior+scrabble+level+1PDF 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_off0000c0d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0D4 16528 bytes
SHA-256: 82c48530a0aa95dfb895584a27b5a68929b7562f0c5e21ba59f2067b516861b6
font_01_sfnt_off0000eba1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000103b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B8 11044 bytes
SHA-256: d139746f5b43a0bd974dec13bcca95206b9854b532a6002db8ba0c6a6ef1ba12

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