Malicious PDF — malware analysis report

Static analysis result for SHA-256 6be89f3ba425099b…

MALICIOUS

PDF

86.4 KB Created: 2021-06-30 02:52:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c0ca7df693289f094a638c758a2ccd81 SHA-1: 8ba015489ba9f8e57c87206b0f9e453c57a3ed2d SHA-256: 6be89f3ba425099b01fd0cd9a175baec599ee1c7ef49372091890039683e4e0f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The document body is unreadable binary data, providing no direct content clues, but the heuristic findings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/b5cc22586b0d7754dea5bfb9c1d17f8b/famakajiwoworifovuv.pdf
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/d0d2542b39da0700458cd481d0855036/28361199705.pdf
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e866d2e85---nopagatir.pdf
    • http://shinies.ru/img/lib/file/6166313756.pdf
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fabe164fd5---70821222493.pdf
    • https://fanaf.comarticle_ressources/file/fidunalumobifikamumalid.pdf
    • http://animationcoach.com/userfiles/file/retigawujevafejefuf.pdf
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/0f3b8d2218402496317e97da90de8bf4/josixiro.pdf
    • http://standartbio.com/fckfiles/file/jufotejokikomotatipedov.pdf
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160960139ed71e---63356155371.pdf
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/490715a91bdd2cdf963da00025ab4652/sajunafibo.pdf
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9bf92e2748---87210215192.pdf
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0baebf01b3---38453443754.pdf
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607042d4549ce---bovutofopogifubol.pdf
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/0b73315ac0cf839c12996d6cafd47440/59756638584.pdf
    • https://hfbee.tw/upload/ckfinder_temp/files/20210626092934.pdf
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/sqphrptqjo5skjhiv4g5pmveo5/xamatefubugoxike.pdf
    • http://www.meditt.com/wp-content/plugins/super-forms/uploads/php/files/knj8lr12b8rl25drc04qgrc6fp/pizukekidopopapugakiku.pdf
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/a01ae06c994cfa039409549f2e5648db/gopikad.pdf
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bc58bd3ddd---54313732772.pdf
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b503fc8cdbb---70897369216.pdf
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/29236583136.pdf
    • http://fautographie.org/images/userfiles/files/ledab.pdf
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094db9e3aeec---7356363275.pdf
    • http://steelbo.com/uploads/admins/u0/files/20210530025728.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=2021+for+aries
    • 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_off0000f032.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF032 16792 bytes
font_01_sfnt_off00010849.bin
ee605081b901fd1d781663caaf34476f2b2e71ee71407084ef29baabe46a4973		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10849 10156 bytes
font_02_sfnt_off00011f29.bin
851b5ea2396d3a8ab3ba67a0b3c8e64706b300c9490f76921640392fb9132f64		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F29 17264 bytes

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