Malicious PDF — malware analysis report

Static analysis result for SHA-256 1926fdfaf123957e…

MALICIOUS

PDF

81.9 KB Created: 2021-07-02 18:45:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5747a1c7971c7cb3c2aa358e1bbe36c3 SHA-1: efe56d4353d9952a11379c340a212d085738edb8 SHA-256: 1926fdfaf123957eb94b193075a8f39bfb5b0253cdccfc912cf3289722089e7c
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file exhibits characteristics of a phishing or malware distribution lure, as indicated by multiple heuristics flagging it as a link farm on compromised CMS uploads and pointing to algorithmically generated URLs. The ClamAV detection and ML classifier further support its malicious nature. Although no scripts were explicitly extracted, the presence of numerous external links suggests an attempt to redirect the user to malicious sites for payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c19c0de1728---darirugapufa.pdf
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/2b19aa5eba1c11bc09681d029581c3a9/33183093160.pdf
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab47bb8f6b5---59337134081.pdf
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/tnr7pbuurg1a5m0mvdt92551oj/disiwonudixotomavik.pdf
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16080eefdf10c6---14437578531.pdf
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/4v83qn9i634olqd7gk1dhlrk76/15117156107.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/letm8vbekq2tqrtpal915p6982/vewelaviwiv.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/d0m464bfv0j3eiua4qci78iu77/83679255666.pdf
    • http://orgue-chantepie.info/FCKeditor/upload/file/90515122238.pdf
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/3m1t47ginqldl2908l3j2boon6/82094675159.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c5f275526b---6688797202.pdf
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a8053f67ec9---41842581806.pdf
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/55om54moqh2n2cahlijr9qnafh/63222015097.pdf
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097927fa96e4---99994601557.pdf
    • http://karpatskiles.ru/store/file/33816927579.pdf
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16099d0bea43ed---givivedoxuvugubopaf.pdf
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acad8ec8750---biwagifetolij.pdf
    • http://asianaccounting.com/admin/fckeditor/userfiles/file/muzexi.pdf
    • http://www.gdchgs.com/admin/img/files/99239907328.pdf
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b8755026062---fafavi.pdf
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160acb91fc894a---54034500456.pdf
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/5794b594459137fa3a8b2dea030ad22c/zugolirapebajer.pdf
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160716c9a8a089---sugiti.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=freshers+resume+download+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_off0000db88.bin
f13d2d27a51b684bd6db7ebd85965bc4444a5e76ad0381bec690bbc39a82e27f
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB88 17580 bytes
font_01_sfnt_off000109c4.bin
7b6a44c633f544998140a87057bb4586953160ad9e05b964d5cd127a35ee8c2c
pdf-font-stream PDF embedded font (sfnt) at offset 0x109C4 10736 bytes
font_02_sfnt_off0001224a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1224A 16792 bytes