Malicious PDF — malware analysis report

Static analysis result for SHA-256 13f8e020ec302774…

MALICIOUS

PDF

86.9 KB Created: 2021-06-26 15:02:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8863a8e7c2bbd195a4ddc865102f7d48 SHA-1: 9e4ab3b3ad1a44de99746a2141cb19bcc4e1d6eb SHA-256: 13f8e020ec3027748221f8d2aeef22df3e2624d5460f25ebdf133d72eca66f77
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as a link farm, with many URLs pointing to compromised or disposable hosting domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the primary attack pattern involves luring users to external sites via embedded links.

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://jmvlpslimited.com/ci/userfiles/files/tinerukifu.pdf
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/6682d3bc6cb8047cc562e749fcb31ca9/japemozivofugoragimufa.pdf
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160a34631c63e3---70292766022.pdf
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/nisv7sl2s2m8igo8e5q7b58gu5/momusadip.pdf
    • http://0965818789.com/CKEdit/upload/files/62959426849.pdf
    • http://toastwarenhuis.nl/app/webroot/files/userfiles/files/nupaxexefarezera.pdf
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608399a159b8a---72745739167.pdf
    • https://amthanhanhsangchinhhang.vn/upload/files/55457320125.pdf
    • https://birsamundapark.in/userfiles/files/13579928155.pdf
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba2a239e8e9---diwebatidifoguguwatuwo.pdf
    • https://senhewood.com/d/files/baxiwalu.pdf
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a69cf873e4d---7880701714.pdf
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160819e7dcc53b---38965748389.pdf
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/46af51570d6398201fb92ca073b8bd6f/buwakenunuvegufazof.pdf
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c3f132a05e9---91657264484.pdf
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bf985eb3c35---98990991935.pdf
    • http://caramelitos.sk/files/20728123096.pdf
    • http://vivatbacchus.hu/files/file/89562958427.pdf
    • https://samarpanbharat.org/trila/userfiles/file/nabozuti.pdf
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a896f5393fa---lugozujufibafogaruwoji.pdf
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160ad30aadc6d2---19506112494.pdf
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1609cdb270869a---43859208491.pdf
    • https://dineflon.com//files/26037351087.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=martini+is+vermouth
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f046.bin
4c726e138c6d2dd0beb75ef0465e9e5342db5af74847b5eae92e2a38b5af0931
pdf-font-stream PDF embedded font (sfnt) at offset 0xF046 10484 bytes
font_01_sfnt_off000107f7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x107F7 16792 bytes
font_02_sfnt_off00012009.bin
57ca2be8df15cf7dc0fa17f28ce1930a5814641ac9435417a910779e7ca64682
pdf-font-stream PDF embedded font (sfnt) at offset 0x12009 17788 bytes