Malicious PDF — malware analysis report

Static analysis result for SHA-256 3972edc37b42d9e6…

MALICIOUS

PDF

80.2 KB Created: 2021-09-03 00:04:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b9e8b21d23900e522848aff83a69a875 SHA-1: a58ae44da956173e7d462a18b13ee1e3ddb32a70 SHA-256: 3972edc37b42d9e61e08801dab3bb7c54cb83aa78a1fca7bf81702f1c1ddad83
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is identified as malicious by ML classifiers and ClamAV, with heuristics indicating it functions as a link farm. Several URLs point to compromised WordPress sites and disposable hosting, suggesting an attempt to distribute further malicious content disguised as application forms. The presence of 'westpac+personal+loan+application+form+pdf' in a URL further supports the phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.micron21.com/application/third_party/ckfinder/userfiles/files/vinimi.pdf In PDF document text
    • https://fonixkoncert.hu/upload/file/69234049615.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/7lir9oavobgv6d759cvo9fs9pc/41298242009.pdfIn PDF document text
    • https://inmaabiladi.com/userfiles/files/4094731559.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/bumidotekozevana.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/0qil82fc6t9ckjoidr4muune10/98553649634.pdfIn PDF document text
    • https://chauphongasia.com/wp-content/plugins/super-forms/uploads/php/files/p0ef5f3ts2btd1rtoolba38g20/geluvotipukigi.pdfIn PDF document text
    • http://beepost.vn/upload/userfiles/files/98260107460.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f9bb06ded0f---29958456043.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/5c5f5d36011f008b64a589b0bb2d1e8a/faretiwaro.pdfIn PDF document text
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/favigiz.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/c937d00d31d857959bbebfd96c9f0118/52347470237.pdfIn PDF document text
    • http://mkpstroitel.ru/upload/files/nolikakedoniwigemezinilo.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd1cc992871---75345426779.pdfIn PDF document text
    • https://olgunbey.com/upload/ckfinder/files/48148760427.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/uqv64ru6eo0gp5e8sl5rfi02om/19506936844.pdfIn PDF document text
    • http://12shio5.com/contents//files/budesamabumepuzivo.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/gazuwofexikezavokadakudot.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/65248146678.pdfIn PDF document text
    • https://magiccat.pro/ckfinder/userfiles/files/nubizizal.pdfIn PDF document text
    • http://sakem.org/userfiles/files/59307816403.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=westpac+personal+loan+application+form+pdfPDF 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_off0000d653.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD653 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE65 17064 bytes
SHA-256: 371bddbd2c960c907614fdaa16fd136b0ba8e47dd0616374651d05eebbabfed9
font_02_sfnt_off00011a1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A1C 10772 bytes
SHA-256: d473c355ed6d055dd842242c599b90f908d894d7c301ad0c29ae5d89a8186798

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