Malicious PDF — malware analysis report

Static analysis result for SHA-256 a729ac6b9f532be1…

MALICIOUS

PDF

85.8 KB Created: 2021-08-03 07:45:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: 7a57a27b03a1bf45224334683f88c506 SHA-1: 6471ac1c2ede1a307679b4fb6f218acfc557d8e9 SHA-256: a729ac6b9f532be1fe84e380e1ca0b2159a73df0f4f4a71cec9c7e2ce754c1b0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9914

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://fivetc.vn/uploads/files/93785935827.pdf In PDF document text
    • http://nutronicltd.com/userfiles/file/funinitidinoterete.pdfIn PDF document text
    • https://maconlux.lu/userfiles/files/biwavumusibiribetaked.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7687b07f9---temejozibo.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c5f0fc4e680---86552208204.pdfIn PDF document text
    • http://blueyee.com/upload/file/15003305756.pdfIn PDF document text
    • https://vettercycles.ch/userfiles/files/86598404809.pdfIn PDF document text
    • https://ita.kru.ac.th/ckfinder/userfiles/files/turoze.pdfIn PDF document text
    • http://alfavs.eu/userfiles/file/purijilarobuzapiz.pdfIn PDF document text
    • http://hochrainer-elsner.at/upload/files/kegebezupogevu.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/83965380215.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16107f4d8d097c---94414400126.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/3b2ad4af3de88b41d23828da8536fd7e/81789230710.pdfIn PDF document text
    • https://empezo.xyz/js/ckfinder/userfiles/files/figufodaxewivebeneg.pdfIn PDF document text
    • http://pazzo.jp/js/upload/files/34408539776.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f41d0c6c3be---66914085590.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/d7do5k1tgtm9gmmmjoi9e12rpj/samopuzogigelad.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608e821f9797b---894238953.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/6a20f01433d8d648c30dab6c9626c0d2/4612054780.pdfIn PDF document text
    • https://faprosid.com/file/94225078151.pdfIn PDF document text
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/jepuzulebosogowovipavuse.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/9i00pbp8c1jhh6seihj3etckb4/76962527759.pdfIn PDF document text
    • http://www.moyekolodin.com/files/47670824787.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/wutovofowawilobuwutifora.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/bapigetijev.pdfIn PDF document text
    • http://canigrup.com/userfiles/file/zodigupuzorudifulovan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=iatf+16949+pdf+2016+standard+free+downloadPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d327.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD327 16792 bytes
SHA-256: eacdbfb0bba6e00519a9778d56de5a9ea68d4f53b1b204f8f44decfea2851b6b
font_01_sfnt_off0000feaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEAA 11144 bytes
SHA-256: db70f193aeef6d6a5659b9b2f28c399eb2ad9e0d1719f45800f642d17bf39022
font_02_sfnt_off000118fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118FA 16080 bytes
SHA-256: b1c6688c4117b2eb132fe321d6e5c0cba7066824bbd4880a4905979a2499efec
font_03_sfnt_off00012e31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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