Malicious PDF — malware analysis report

Static analysis result for SHA-256 06c42021b84a8864…

MALICIOUS

PDF

88.1 KB Created: 2021-06-30 08:28:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: a4f5cd47bd99c9c58321069161597cc3 SHA-1: a9a0ae82f5ba5f5ef2bf7a4063c52e2a0ce69c37 SHA-256: 06c42021b84a88646be0190fe02bbcdaa6e657b21614bdd5cdf4bfb7b22f4c60
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with numerous URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting an attempt to distribute malicious content or phish users. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://sosnovgeo.ru/userfiles/file/37145372680.pdf In PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a9647dd2d1b---befunusazigu.pdfIn PDF document text
    • https://unosms.us/userfiles/file/zexogorigateborisuji.pdfIn PDF document text
    • http://domholidays.com/userfiles/file/76993142808.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160941e7c4ef09---15650258740.pdfIn PDF document text
    • https://botorka.ro/userfiles/file/80870689280.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/xonajolodotaxugebu.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/k2j4kjm37jllrlva9ub3qhc7ao/pekez.pdfIn PDF document text
    • http://nakatka.com/files/file/99250949550.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/3dd234f59bd61cc85e857145c5115273/bokitutupuvemofatid.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160b571448aae8---wubugedalemunijafoxijekar.pdfIn PDF document text
    • http://cga82.com/admin/File/vaxuzedaziniwadivusasid.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/82b38fde9fd5c064df7231beef7f1ebc/45936640983.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/bavakeramini.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb099363ec---bozaforum.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608f842cdd2e2---57109619281.pdfIn PDF document text
    • https://www.alapan.org/fckimages/file/66253481439.pdfIn PDF document text
    • https://pmfegypt.com/userfiles/files/86580817605.pdfIn PDF document text
    • http://shriadinathbank.com/uploads/kokume.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc0193da93---tusiparito.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/kdr5f3ii7pvb4s5qmksn8btmh5/jaxedadagi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=training+plan+to+increase+ftpPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f42b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF42B 17852 bytes
SHA-256: 18d1f9f79798d1cf481966d782bc8dad8138a6ba223e53d9b498c183f86cf9e7
font_01_sfnt_off000122ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122EF 10620 bytes
SHA-256: 1435cf06abc73a18e0c5333b234021fc549635a3ff5e808385ad6071d9d63c9c
font_02_sfnt_off00013b58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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