Malicious PDF — malware analysis report

Static analysis result for SHA-256 593facc39efedf51…

MALICIOUS

PDF

101.2 KB Created: 2021-10-13 13:50:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: e782d03853bdc6d934e24366bf4228ca SHA-1: 2886ca28a1c96f32a5ae2f06f6c5b818415ebfed SHA-256: 593facc39efedf51f03e4850188349d14742c4981f4866d66834e2e304b89231
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://philabc.ru/uplcv?utm_term=sow+the+seeds+of PDF link annotation
    • http://markalikonut.com/UserFiles/file/62827020022.pdfIn PDF document text
    • http://hardiebase.com/uploads/assets/filefile/kajoxune.pdfIn PDF document text
    • http://makairways.in/home/makairways2017/public_html/dowalumniusa/ckfinder/userfiles/files/82367070758.pdfIn PDF document text
    • http://lnv-cnc.gr/userfiles/file/newulanipanem.pdfIn PDF document text
    • https://ijmscr.com/ckfinder/userfiles/files/rovopigojekigazinonero.pdfIn PDF document text
    • http://lightofislamonair.org/uploads/files/jofinuzugaje.pdfIn PDF document text
    • http://cauthangdep24h.com/upload/files/winebeduz.pdfIn PDF document text
    • http://ulv-fogger.ru/d/files/89362152339.pdfIn PDF document text
    • https://kuraniterbiye.com/resimler/files/jenoruvononogemoxunemet.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/0b89e82a79f602dd30607c9dd0a8aaf2/tutisapelakanekeloditaxef.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16144a5db6c378---bafolu.pdfIn PDF document text
    • http://kustari.net/userfiles/file/55826471572.pdfIn PDF document text
    • https://u15.ch/ckfinder/userfiles/files/20721392102.pdfIn PDF document text
    • http://idrogastermoclima.it/Utentifile/FCKPage/file/dutuguviberot.pdfIn PDF document text
    • https://mokhalasati.com/userfiles/files/9633957680.pdfIn PDF document text
    • http://belniig.by/public/file/kikomuzevifulewi.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/96390439695.pdfIn PDF document text
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/76835217124.pdfIn PDF document text
    • https://taperagi.com/contents/files/4688044219.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/6dc5cf6078b5612b7d5e4274cec8f562/lolavovewuzaw.pdfIn PDF document text
    • http://nataliashishkina.com/userfiles/file/33831949746.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/26598223998.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_off0001243a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1243A 20260 bytes
SHA-256: c681ca9bd2300e05892c3c8a0cd37dfdaf6c067dbd8fe7df7747efc2e5669945
font_01_sfnt_off000158cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000170e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x170E3 10108 bytes
SHA-256: bbb40c3f10bab426fce14407da8728d18d318ddb8d91031ac82f06af17059828