Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f61fb2a3ed73d56…

MALICIOUS

PDF

86.4 KB Created: 2021-07-15 16:27:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c588347cd3f72bae6f95f11c19f79722 SHA-1: 6a1ced170e5f0f711f50ddb37a82c29cf35c6b09 SHA-256: 5f61fb2a3ed73d56b5a9d30a88013975802c31417ceb00556e40fde3346d227e
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised CMS uploads and disposable hosting domains, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3109b6f05a---jabuwatizile.pdf In PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/3ec42b91d9bb27da147cbcf4eb9c646b/ranilowebi.pdfIn PDF document text
    • https://www.oalysa.cz/ckfinder/userfiles/files/mewot.pdfIn PDF document text
    • http://liffeyartefacts.com/fckimagefile/file/76408309793.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086668ae5eef---84424441440.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/43829392772.pdfIn PDF document text
    • http://aps-mes.com/files/file/jedivagojedokakukum.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/cdfe58de87894e77182beef7b7e5cb89/42801497045.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/jtmaenl59qi7838dk1srs66b0q/bowojumanenenajo.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/66149741175.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/lilixirivapobuwiw.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/c213130d18682aa3959e79b83173f3a3/932742237.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/16086716340b52---84516622865.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/eb02c59a28376f0de42c8f96d0d28e61/45355955032.pdfIn PDF document text
    • http://twfindia.in/userfiles/files/86193641496.pdfIn PDF document text
    • http://caramelitos.sk/files/wutoliwugoxazivebat.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/9p0b3rda48fottj3vl8dqgrk4e/kijafewuwifawuben.pdfIn PDF document text
    • https://coebmsf.com/userfiles/file/95706802044.pdfIn PDF document text
    • http://piecco.eu/upload/files/52614132340.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/67b58a246deec7c442b4b52b3cd4c36c/jelevavetepepipetewopeze.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/210519143634674553gt2snf.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/268ef2faa07c00563d4875ea7444c8e4/49891799857.pdfIn PDF document text
    • http://oilandgaswork.com/userfiles/file/60286540745.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=the+truth+project+lesson+8PDF 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_off0000ed6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED6C 10620 bytes
SHA-256: 51e007665ec32a787d1fce4dfd66312479b1ad3c85e6723837f09f4690e6d8ca
font_01_sfnt_off000105bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011dce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DCE 17700 bytes
SHA-256: c8d8909e31a9b5b7ad144493e47c62018c1652898b2f85632bcaecea3fe888bd