Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2848fb804d456d3…

MALICIOUS

PDF

69.0 KB Created: 2021-04-27 19:52:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8a4b559df703bbd76a23ae2d84bacae1 SHA-1: 241f0220f5ae3ce270ae003da4ee933b00ff90d0 SHA-256: f2848fb804d456d32a1f09e280cb9cc03f672ebdaa336a7c4543e8b8dcb1880e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to compromised WordPress upload directories, suggesting an attempt to distribute further malicious content or phish users. The document body, though heavily obfuscated, appears to be a lure related to a Samsung A20 APK, likely to trick users into clicking the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/otge19abbd3p0dd2src0naod3b/25859987598.pdf
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/odkb7ftqpvbjel75opetndglq2/29953783376.pdf
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/181e7f2ca4ac15c792b5c8dd2108a1c5/44704505826.pdf
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/eda3c1e29123e248b3eb4acb9e0fe2e0/70794373554.pdf
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/eh7u1h6gom2mcftq8l4o8aqep8/bitinagijajira.pdf
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16074a0b7dc62f---48709738506.pdf
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16086655a8f5e8---886899478.pdf
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/6b15a8a268de50980e3d5149730a42dc/72774592167.pdf
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7e6d4b83f---85592280062.pdf
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160794c0d2f3d0---16444043942.pdf
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/6d989fb695a218dbcf95a9d3d72e0923/73950836932.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/f2164ad478f9b7b5ef2e3c28d55bcc4e/16841286713.pdf
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607e059569f2e---15141926508.pdf
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/717fc251bc7e454e659803f192b5f24c/weralimalitipo.pdf
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160707f9d82af1---tevoretava.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=samsung+a20+always+on+display+apk
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d04b.bin
848f89d6d2d3fbebcc5376ed57a980e19e4bdfc4d2783df5d5d1817754adad14		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD04B 5820 bytes
font_01_sfnt_off0000e425.bin
9e0a572dc22f5f5324834a9cfba94bb5d236f24f96262e2f25b869fa42e2e1f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE425 10320 bytes

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