Malicious PDF — malware analysis report

Static analysis result for SHA-256 aacaf12c17d73b87…

MALICIOUS

PDF

71.9 KB Created: 2021-09-30 19:34:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 79d966bd4208bdbac7cb6409fd6591fb SHA-1: f10954933d010eac34b416ce7c429ee89ac0e642 SHA-256: aacaf12c17d73b87ce23a1ac5a4f437180b15e83e8f73b313452025d256bc1ee
176 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics indicate the document functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads. The presence of numerous links, including one pointing to a compromised WordPress upload, suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://skywaynepal.com/userfiles/file/kaxitenukabu.pdf In PDF document text
    • http://cmtsport.com/pliki/19541298357.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/60831505948.pdfIn PDF document text
    • http://clinical-pain.com/pds/userfiles/files/kanakezonu.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/lenazeniwizujiluruw.pdfIn PDF document text
    • http://kxqcgs.com/filespath/files/20210925155440.pdfIn PDF document text
    • https://valubil.com/public/uploads/cms_file/cms_files/wekedajumaridobor.pdfIn PDF document text
    • https://imagebuzz.net/ckfinder/userfiles/files/lovoxekalanamefedemisag.pdfIn PDF document text
    • http://thaifilmind.com/upload/files/5453848659.pdfIn PDF document text
    • http://highgaincomposites.com/img/file/2021936483.pdfIn PDF document text
    • http://nutrizionisti.eu/public/thread/risorse/file/15073082492.pdfIn PDF document text
    • http://mybyblos.com/userfiles/file/jebinavusemosanim.pdfIn PDF document text
    • https://impeka.lt/components/com_mijoshop/opencart/image/data/files/gorasilamuzegunojuluduful.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/puzalimanifewiraxutekov.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/161538f3390197---48493654569.pdfIn PDF document text
    • http://doggystylzgrooming.com/admin/photos/file/tuzaputokowexisu.pdfIn PDF document text
    • http://homeshopeez.com/uploaded_files/userfiles/files/42030591489.pdfIn PDF document text
    • http://mwbright.com/upload_fck/file/2021-9-6/20210906151811629952.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/43793920504.pdfIn PDF document text
    • http://cocoon-source-harmonie.fr/public/file/13502677085.pdfIn PDF document text
    • https://tahitotfalu.hu/ckfinder/userfiles/files/tekonulo.pdfIn PDF document text
    • http://aquaclub.hu/userfiles/file/miroxodakapiniki.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/161420bca7052c---24817454362.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ca741ec602---wegubigozu.pdfIn PDF document text
    • https://www.domosystem.gr/ckfinder/userfiles/files/82018101423.pdfIn PDF document text
    • http://batterseataxi.com/survey/userfiles/files/wojafesefezodiba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=turn+off+chrome+dark+mode+windows+10PDF 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_off0000b42c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB42C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC3E 17328 bytes
SHA-256: 368044f1a5ea3ed66ce9d2e7d009038b52fe184612a0f060876c003dccefdf65
font_02_sfnt_off0000f876.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF876 11012 bytes
SHA-256: d3c7661c10f0787cf3be275cd22c8f7453dacc50e1f0fc6e2e4171745699c86f

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