Malicious PDF — malware analysis report

Static analysis result for SHA-256 74fcb0879743b4b8…

MALICIOUS

PDF

83.9 KB Created: 2021-09-12 09:58:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 038771b3dc91c5de5f04192c9b5cdecd SHA-1: 32da2ed770fe262c57dc76dec6b1a725546ed0ca SHA-256: 74fcb0879743b4b833d7b9b6fe8fb5bf86365e628c1425c2477b183cf777ed23
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution intent. It functions as a link farm, with numerous embedded URLs pointing to external sites, some of which are hosted on compromised WordPress installations or disposable domains. The primary purpose appears to be directing users to potentially harmful content or further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://chcial.ru/uplcv?utm_term=rebel+racing+free+download PDF link annotation
    • http://4grd.com/cmsimages/file/fumuteza.pdfIn PDF document text
    • http://coffee33.ru/archive/file/44986462376.pdfIn PDF document text
    • https://mcq-exambd.bdbabymart.com/app/webroot/ckfinder/userfiles/files/jivutukovomuro.pdfIn PDF document text
    • https://aarhuskortet.dk/images/file/99008703621.pdfIn PDF document text
    • http://ccadl.com/files/20210901170748.pdfIn PDF document text
    • https://aashianarealty.com/file/8741201994.pdfIn PDF document text
    • https://www.shropshirefurniture.co.uk/admin/ckfinder/userfiles/files/goneduwutorijuvenaxajef.pdfIn PDF document text
    • https://valgott.com/images/userfiles/file/68702664954.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/17170366502.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/4570711671.pdfIn PDF document text
    • http://ambvetbrashersclavoghisu.eu/userfiles/files/wovoniz.pdfIn PDF document text
    • http://worldplastsolution.com/ckfinder/userfiles/files/72072549218.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613a1415e8af5---lemaropimakerelidobadide.pdfIn PDF document text
    • http://abyss.sk/userfiles/file/lafevigowa.pdfIn PDF document text
    • https://foodexgida.com/uploads/files/visedogodojob.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/wipajowan.pdfIn PDF document text
    • https://khachsan295doson.vn/namthuan/images/news/files/69113613759.pdfIn PDF document text
    • https://coverline.ro/userfiles/file/12151780342.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/2037c14a0fd23424665b0aeb707cb5a5/tekokidowogelijotafalo.pdfIn PDF document text
    • http://rafaelokazakov.com/file/rajigojabalizuviki.pdfIn PDF document text
    • https://zenithoverseas.com/assets/userfiles/files/junutozexeganimex.pdfIn PDF document text
    • http://kammed.com/userfiles/file/mevuzukadixefopasorixo.pdfIn PDF document text
    • http://faisaltowel.com/survey/userfiles/files/nofemuligimapidororim.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/afab765ade4fcd712079bfe47f5812ba/85387674548.pdfIn PDF document text
    • http://dastone.ru/userfiles/file/gomuparazufoduwusexev.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e305.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE305 17508 bytes
SHA-256: 16bd89c9b27b96554a9ef05f4930e774fd9def1de1c643e07eb7cd239f0c5ed0
font_01_sfnt_off00011107.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11107 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001291e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1291E 10656 bytes
SHA-256: ed0423e20f94dbcb6d14ab43d26ee6ff84775a09515416682ab910d4f2c29e32