Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bc93d4540d63d21…

MALICIOUS

PDF

101.2 KB Created: 2021-07-04 05:56:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4fa54478618ed261e8c1640b17c204e2 SHA-1: 38edb6ec75cab22de4a96f60116dfaa87b644e15 SHA-256: 9bc93d4540d63d21a5c3558a7c1ef5120f2bc7564c82193930e9a58d768d3ec6
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious redirection tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9767

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/6e8b3a46d566534c7ab880cf8b45ab13/xovuxutubajakirosuvaz.pdf
    • http://157.230.241.115/image/upload/File/xuxirerupomanedupet.pdf
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/d278e6883b4dd2302014b1370fdc0a5f/90680058361.pdf
    • http://twfindia.in/userfiles/files/xewume.pdf
    • http://hobbstownis100.com/clients/6/66/66141d04a4341350d76ae3a38785cb5a/File/74577498149.pdf
    • https://agatanorek.com/files/file/64948008077.pdf
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/7n9pbcb1ocgc82u9nndnlg4a64/tanojujakexemiso.pdf
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160997aa352535---kasugalusitu.pdf
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e134d3867f---liwetovafixo.pdf
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160ab5c3ec7ba2---82338899082.pdf
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d612825dba7---1134430958.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/3f5e46b4618a4fc3109dd1351010dd49/soketilagaj.pdf
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c84ea86ffaa---xusabujiwexipomukepin.pdf
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607159820ce56---61275977826.pdf
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/8f4ab82e497240167a9c278ada0b166b/42680729474.pdf
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/berabufabibavuvesodepalu.pdf
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16082186d879bf---8086275662.pdf
    • http://bukharageorgia.com/sites/default/files/file/vowegejegefofudo.pdf
    • http://aihyang.com/userfiles/file/19104450598.pdf
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/e4bcc9bdcbcefd3b14c65fe1e8560d06/rexegapizukirefibedamufom.pdf
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/2a479f5185955c51f2d02f65125dc45f/70710836402.pdf
    • http://novussiteyonetimi.com/uploads/file/wenirupot.pdf
    • http://oreade-breche.fr/userfiles/file/wivulupojikakuwawel.pdf
    • https://bjsteelvietnam.com/upload/fck/file/86144051853.pdf
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160adfd91c727d---19374688230.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=music+id+for+savage+love
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fbe0.bin
9d9d45a4b739ed45baa909c012ea5c91f5f93b4275b6036914dfcca1564ae43f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE0 16508 bytes
font_01_sfnt_off000112d7.bin
aff438e0b2b164b9824628d4c6d55102f05d1051c6938b7447f75936d01fbd65		 pdf-font-stream PDF embedded font (sfnt) at offset 0x112D7 10608 bytes
font_02_sfnt_off00012b02.bin
f01d5f023413df53387290e7741d59311782ccde1dc01d1f9bfc6e380b7a5d7b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12B02 24764 bytes
font_03_sfnt_off00016683.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16683 16792 bytes
font_04_sfnt_off00017e90.bin
4399651035424788af89a61815135da753d7a2ba72e38705d6f444edb27b28e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17E90 1704 bytes

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