Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6b3007589c0eb0e…

MALICIOUS

PDF

84.8 KB Created: 2021-06-27 23:52:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b5f2082af8fd7a4f0b134c307e713d93 SHA-1: 0ed9f0ff098b68891aa3b1f691e0ffa4f7ea4a61 SHA-256: c6b3007589c0eb0ebfd10ee4452af0b77c916ca2ef404c3508d7c73010034fb7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The presence of external URIs and link farm characteristics suggests the primary goal is to redirect users to potentially malicious sites for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://allytemp.ru/uplcv?utm_term=is+swiss+cheese+fattening
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/c100fd8e46042c16fe7771bf8ca8a167/78802125371.pdf
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/9sm5ck1tahfqhjelc0ae054gll/80879790975.pdf
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/5e0747eb0b959a78e3841351e0007ee6/nisuvigepitavuditikiji.pdf
    • https://ludifrance.fr/userfiles/file/56020023920.pdf
    • http://aa-nusd.jp/38275485998.pdf
    • https://avigailpekelman.com/sites/default/files/file/32890986828.pdf
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/9c8d01e4923e5ce54dc82d460103f31c/23683221067.pdf
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/16097e78e4d2e0---86641260001.pdf
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/c374f1b92fc9e0abb3f01347173f374b/fikuxenepapevevumeluw.pdf
    • http://biomassasia.net/data_ed/userfiles/file/tiwanuvulubevi.pdf
    • https://implant-drill.com/userfiles/file/42053897558.pdf
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b49887b5d95---86614771397.pdf
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a79016e1ac8---8459601594.pdf
    • https://lamthong-marchph.com/piceditor/file/dizefopevagoxafevami.pdf
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/da07e6d172eba0c29fc86167ae97f036/89540806565.pdf
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/9764749459.pdf
    • http://cosmic-kino.ru/sadm_files/revefapokebu.pdf
    • http://omegapizza.net/uploads/files/36017867365.pdf
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2d32e6aba5---61617585636.pdf
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607c195dcbd65---bokewaluwijudigu.pdf
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c6437aed526---77173916977.pdf
    • http://yfatc.com/userfiles/file/xivop.pdf
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c312a0ab971---gowokogaf.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_off0000e991.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE991 16792 bytes
font_01_sfnt_off000101a8.bin
d4cd9c610791b65bbef9e51d170d692d55d7a484e60bb40745e519944fa48962
pdf-font-stream PDF embedded font (sfnt) at offset 0x101A8 10388 bytes
font_02_sfnt_off0001192e.bin
f523980c7b3c4ca6374b5b8ef9e35aee01f19fed0159976a5b16000e917dc591
pdf-font-stream PDF embedded font (sfnt) at offset 0x1192E 17400 bytes