Malicious PDF — malware analysis report

Static analysis result for SHA-256 643dd7a2bedd321d…

MALICIOUS

PDF

78.7 KB Created: 2021-09-01 08:50:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ed9ebdf19c6e4f179b6fcb04868fd6c0 SHA-1: f89d5b124d7a5172f5d3401829988b9d99dad277 SHA-256: 643dd7a2bedd321dd710c96d96edd3d6659bc969159b4b3f02bb5329f6e69458
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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 http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bff36f082a7---73574600565.pdf In PDF document text
    • http://www.alcera.ca/userfiles/file/xozewopugimemelur.pdfIn PDF document text
    • http://alanaf.ru/userfiles/files/deteze.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160707427f2cf3---73071386498.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cac7ecb739e---62717713599.pdfIn PDF document text
    • http://pampa.be/uploads/userfiles/files/28249857561.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cabeec80bef---32666616544.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b510414c8a---daxotemana.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0ff01f444---43649784270.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/25308056916.pdfIn PDF document text
    • http://espokebar.com/uploads/files/12194527032.pdfIn PDF document text
    • http://cabini.it/userfiles/files/22386036247.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/47664356043.pdfIn PDF document text
    • http://gmkms.net/upfile_editor/2021/files/xadepalubimujovudazedulab.pdfIn PDF document text
    • https://olgapopovaphoto.com/wp-content/plugins/super-forms/uploads/php/files/f566409a625651dba082d7974eb0cdad/75337957799.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/8529762419.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2e16df1e3d---93854064156.pdfIn PDF document text
    • https://cortopolis.ar/userfiles/file/ruragatoza.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160768a211a6da---46020601333.pdfIn PDF document text
    • https://xuanhongkhang.com/upload/files/nijugizijirekose.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/c89f890d462c32706ee8691c2fea2f47/tofefepiluraw.pdfIn PDF document text
    • http://alfadent-volg.ru/images_uploads/files/68330368528.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16085873a32174---momegeburugatokapizaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=application+of+statistics+in+computer+science+pdfPDF link annotation
    • 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_off0000cc27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC27 17548 bytes
SHA-256: 5c305622045c4e30662b78b034158210fc096ce0ad170fb52e69b451e5d636e5
font_01_sfnt_off0000f8f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001110b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1110B 10864 bytes
SHA-256: cd3337a7ad7d51defba531c04b0d0e64ce17b8dea9b3bb2e5fe743ff99eabb9d

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