Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b0e9b13e5b1823b…

MALICIOUS

PDF

81.3 KB Created: 2021-07-03 14:53:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 6d5718c4e123a89bbd904abe3268fbe4 SHA-1: c2b19b7b0e649ddee1a8960b0272e95f109079b6 SHA-256: 4b0e9b13e5b1823bc25e3549dd7bcb94953cffa36d86018dec478862bc3e3b75
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://crysiq.ru/uplcv?utm_term=negative+hpv+test+but+abnormal+cells PDF link annotation
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/5d2v9hvdqa9d3sbu8423ip3777/ruwelugevawuseximojanopax.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/c7b52c11d19fb11de3de645ced751918/xapogagifituxi.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160929408b01da---97973569990.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f2f13953ca---44977316754.pdfIn PDF document text
    • http://ccshecea.org/upload/files/34179426019.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/fe590db2ed89c4f38d38a6fcd96c5083/jeweroligewatiruvegi.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/7d9e00864384080b6b0a18e381222f14/89226267872.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/0q2jicm2d6b21120b24ub4ud0g/24575355559.pdfIn PDF document text
    • http://klefmarken.se/upload/file/38347404738.pdfIn PDF document text
    • http://www.tramag.pl/upload/file/zixawitorogusag.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a03bf6aff10---76066540106.pdfIn PDF document text
    • https://kuepancong.com/contents//files/ronitibepogidu.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/gexakeg.pdfIn PDF document text
    • http://righetti-ticozzi.it/userfiles/files/tegeniwutuwajilepidagu.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c227066a166---mosad.pdfIn PDF document text
    • http://feriaalainversa.com/uploaded/files/53474967026.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/t6o13gg3skeaq1idjqlqdvjf97/65709250810.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/ti1csc2n2mi9aq101b80jjsr2n/52978907794.pdfIn PDF document text
    • https://mauspro.net/upload/files/wirikazegaxu.pdfIn PDF document text
    • http://omak1968.com/clients/71178/File/7992586801.pdfIn PDF document text
    • http://lamelove-zakryti.cz/userfiles/file/13701222984.pdfIn PDF document text
    • http://koreanhotpot.com/uploads/files/10110353670.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984c031d6c3---wedajibomow.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d830.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD830 17600 bytes
SHA-256: a9cd43c03c9e1f3430097a693ed0ad75e9ebcc7b42b92a7fc711c2d0b58778d2
font_01_sfnt_off00010612.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10612 11104 bytes
SHA-256: 8ca3d49b3e9c6061e60498da15301586c2d1392c365c5da5e8483a6d920915dc
font_02_sfnt_off00011f9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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