Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4c2ce5d5513ba90…

MALICIOUS

PDF

74.4 KB Created: 2021-08-20 02:01:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7cd8a8080b3467e7626b616d2b1dcaf0 SHA-1: 2342704fd593d1daefab16097c3c14b2f94f334a SHA-256: a4c2ce5d5513ba9070499d10ae18e7b54bfefbbb4b41cd7b29fa2fecee01d0dd
196 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. It contains numerous embedded links pointing to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution campaign. The PDF_RANDOM_URL_LINK heuristic further supports the malicious nature by identifying links to algorithmically generated URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 https://chcial.ru/uplcv?utm_term=algebra+expanding+brackets+worksheet+pdf PDF link annotation
    • http://eprdel.cz/userfiles/file/68628966149.pdfIn PDF document text
    • https://ostrichpharmaceuticals.com/userfiles/file/zirosavowasikatul.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f0619d773---15777449088.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/e98e1dc9a6c62d7d629c1a3bd7983f2c/nalegetidajumu.pdfIn PDF document text
    • http://gwhs79.com/clients/867100/File/gefufowotijer.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/a5040be3e369948ea32969d822c251b9/51709732247.pdfIn PDF document text
    • http://puginternational.com/ckfinder/userfiles/files/91906859636.pdfIn PDF document text
    • http://lucidarepavimentimarmogenovaealessandria.it/userfiles/files/deguvoxob.pdfIn PDF document text
    • http://leaders-adv.net/userfiles/file/mofolafelokaxuvoras.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/4q0mlpea3onhmep1si2snm2649/97457051544.pdfIn PDF document text
    • https://webfox.net.au/wp-content/plugins/super-forms/uploads/php/files/3a901a8683dd1e1e9a34ac40b96262ae/gitatiwawurevow.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/9dc8260b8ff9a6c76cfd624604c151f4/gidakesutakaduwitamaso.pdfIn PDF document text
    • http://bwc.lt/i/kevotejozitanadekum.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/658896e05bf9fe4cf9f82e3a02bdba30/65919267042.pdfIn PDF document text
    • https://mfdesign.hu/files/file/tabinobavuwojulibupuxewop.pdfIn PDF document text
    • http://stellarp.com/userfiles/files/63775947184.pdfIn PDF document text
    • https://kingcarmotorista.net/uploads/files/26167658538.pdfIn PDF document text
    • http://vizit-k.net/uploads/editor/files/buveb.pdfIn PDF document text
    • http://hocikto.info/userfiles/file/tujukobolipo.pdfIn PDF document text
    • https://kueapem.com/contents//files/20493105382.pdfIn PDF document text
    • http://coffee33.ru/archive/file/30460004619.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/xijasevomesewagifog.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_off0000c062.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC062 15616 bytes
SHA-256: 9fa571a45e4abfee265893620417f9e2c937ef385630ecbfede187ac91ecbd11
font_01_sfnt_off0000e8a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000100c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C0 11300 bytes
SHA-256: 10a4d5bebe8282191391bf4e83b9715c9bf70f05d708a4d677d8f90003debb0b

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