Malicious PDF — malware analysis report

Static analysis result for SHA-256 1db62318b49c0b18…

MALICIOUS

PDF

90.7 KB Created: 2021-06-29 00:25:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d8170f588a258012665eb3824c77dcef SHA-1: 54c35fce189a85ca1b43e7395aa000fdcb42a42a SHA-256: 1db62318b49c0b18b1a312d1d8640bfa9b2ff8c2c599c7826323d09791a0d1d1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised websites, likely intended to lure users into downloading further malicious content or submitting sensitive information. The document body is heavily obfuscated and unreadable, providing no direct textual clues, but the heuristic firings strongly indicate a malicious intent via external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://ekransamara.ru/files/98280563157.pdf
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9d65cc147---29161845777.pdf
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/dhcbh2jr447gvbkngdppgg19bm/niwafipagik.pdf
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/201ee580dae8c0827ea0cf921af16f0e/gizobedugedonejenuxegon.pdf
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607681bb1bbb8---ratilawe.pdf
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/8gsup5lnd2ppntldkafietj0aa/zikelujilor.pdf
    • http://copy2d.com/ftp/image/file/lemarutam.pdf
    • http://candybeauty.vn/upload/files/7342961435.pdf
    • http://animalscipublisher.com/files/upfiles/file/3304842912.pdf
    • https://spa-salon.ru/ckfinder/userfiles/files/87237776041.pdf
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/f2f6255b4cc142c37b0ff627e472d576/19638259564.pdf
    • http://sun-eko.eu/files/file/80553351059.pdf
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160836d0aa18b3---22364181167.pdf
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/cfd4c388f6a5ccebcb4b787cc25cdd8e/23781469354.pdf
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf9e40395dc---40007965201.pdf
    • https://alianzatours.com/imagenes/file/lukuzekivovobagupas.pdf
    • https://langumeistras.lt/i/File/38645459264.pdf
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa875f8bef7---fovajabufesegot.pdf
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/fb613c68edd62eb70b5d83aee69967df/41398317192.pdf
    • https://namlongadc.vn/uploads/news/files/ditajopurodido.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0cae552576---dukekevuwuwizu.pdf
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7f910ef794ff7f0584bfb0694378dfe5/riteratowamapuv.pdf
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/0c228aab9cdeebd380c8f45041c8718f/96319562172.pdf
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/43096b3ec3d42bd38e422dad1dd2b02d/fixipetikamerapovusa.pdf
    • http://nicenpos.com/userData/board/file/43872969348.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=total+quality+management+in+higher+education+pdf
    • 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_off000100b6.bin
d6f668bb16b6dcf278d5b35fd792829d32c5059af93a6e3bff45dd63a0e7a597		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100B6 16484 bytes
font_01_sfnt_off00012b3c.bin
19f478296d2e653da2230a171faf53f6fba61ddf4efe32954f404356826a7932		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12B3C 11220 bytes
font_02_sfnt_off000144d0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x144D0 16792 bytes

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