Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c705f5451319145…

MALICIOUS

PDF

96.7 KB Created: 2021-09-23 15:49:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: df0be7b8c5e830707e968ca7acf81c64 SHA-1: e48208989f4096b32f9aa6c5881315bec93fcc5c SHA-256: 5c705f54513191454a3bc76f4c2b065a5e754fd70548fa06d6831a8a875d41f0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://medvor.ru/uplcv?utm_term=free+offline+anime+apps PDF link annotation
    • http://huyminhplastic.com/upload/files/bovivixugitik.pdfIn PDF document text
    • https://mayxaydungthienlong.com/uploads/files/files/paruremikij.pdfIn PDF document text
    • http://bibliotekaludwin.pl/img/upload/files/43063656419.pdfIn PDF document text
    • http://artanuji.ge/admin/ckeditor/ckfinder/userfiles/files/puxugirajelakisika.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147269d4a363---lamofomuribotonimazovefi.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161354006db569---jotogawak.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/xesugikowuziseja.pdfIn PDF document text
    • https://neurondevelopment.org/userfiles/file/pinukufojawumuwopabopumu.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/18000162892.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16135a5f05ec30---pofirorasumegoj.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/zubupuvokufug.pdfIn PDF document text
    • http://kedehg.com/ckfinder/userfiles/files/72394162734.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/9f59254532cd0f5eb9c9f87ffe104bed/gabasuz.pdfIn PDF document text
    • http://kovospm.cz/fotky/file/nogipojarafexulowogevo.pdfIn PDF document text
    • https://habibitours.com/ckfinder/userfiles/files/33951982132.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210919170514.pdfIn PDF document text
    • https://sabagdasarov.ru/upload/file/59156320485.pdfIn PDF document text
    • https://xn--23-6kci4asohe8k.xn--p1ai/userfiles/file/60467591963.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e01ba920f8---nizupakewowulip.pdfIn PDF document text
    • http://biosafety.biz/ckfinder/userfiles/files/jofiluribelepiguselu.pdfIn PDF document text
    • http://namadagaskare.ru/ckfinder/userfiles/files/66033964945.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/a6b0a415a45651660389462d3264e327/vifabazuzasadugafaxexe.pdfIn PDF document text
    • http://pol2-simf.ru/userfiles/file/zonepazesokuwa.pdfIn PDF document text
    • http://www.cenlafilm.com/siteuploads/editorimg/file/riwejulovuzowujem.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_off0001171f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1171F 18028 bytes
SHA-256: 307d5e13e05e98f2c9bd2671abbfd6f47312be4d3b4ccc50a710d6b475751583
font_01_sfnt_off000145e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015dfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DFB 10400 bytes
SHA-256: 8aebeac639c02ca3fe72d0dc077c9c6103502aefa87365bb9eacd20c5f9e3daf

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