Malicious PDF — malware analysis report

Static analysis result for SHA-256 db1faf4ae71354e8…

MALICIOUS

PDF

80.9 KB Created: 2021-07-02 03:07:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d84416bc6ee095c7dbb9ad720c8c0116 SHA-1: 8508c1f0a9660404dccf46d0c0c2cff6d02ac4f4 SHA-256: db1faf4ae71354e85623edf021e663f03097a1b1d2a2feda442cdccd3451b33f
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many embedded URLs pointing to compromised CMS uploads and disposable hosting. The document body is unreadable binary data, suggesting it's not intended for direct user interaction but rather to host malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16080f16d1d2ad---19106447257.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/q3gmsvrggk7cmup6ufeo8642hm/milisatibigesepisabajen.pdf
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/49ca578df1b85c75d1ea32ae6fac256e/xivilajidufamipilas.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/596c4ac5f27872cdd1c70d16d14f5a15/41622073703.pdf
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c4979d0d716af2a36d7a171cc36358f3/badurizudevovazinobevek.pdf
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/d250bd2e21e6cd806c88d9a2f23ec5d0/94306365248.pdf
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d798d1b3e---36620623067.pdf
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba0dfd2190---6355544112.pdf
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c90a7988dd4---xexodigedizobuxig.pdf
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c0d8c2340d---74090594760.pdf
    • https://finances-canada.com/wp-content/plugins/super-forms/uploads/php/files/9a2a206a6c2ba3f3ad80b5ccca0d299e/bafuvim.pdf
    • http://bjaimama.com/data/upload/2021/06/file/202106292245553789.pdf
    • http://wchs67.com/clients/f/fd/fd50fd9748f3592dabdfdad26f378f15/File/jiloxenezowojekabijegibuv.pdf
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/55356bc7618efffc05087fd2a76d325a/36631917967.pdf
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/db6qqfub1lak5phiganb9ors3k/serokazo.pdf
    • http://avonsteel.com/UserFiles/file/kodipelasisonabigezimaro.pdf
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/6e424b0e54189e03de3ac70378a0b138/63129848974.pdf
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/ded6907ecffdb9a81846e9b5429738f6/nejerupa.pdf
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/db29c241759486992804d6b4fde236e9/59113982492.pdf
    • http://aaaexpressheating.com/userfiles/file/wijapafokaselejewisu.pdf
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608327a95a1bb---wubolaloxozi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=hummingbird+in+slow+motion
    • http://e1pl2.nazwa.pl/busy/fotki/file/56953023104.pdf
    • 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_off0000d934.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD934 16792 bytes
font_01_sfnt_off0000f146.bin
344ebaa01665a607c676aad089218a835df36b444427ec0b64ef76553e25a612		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF146 17660 bytes
font_02_sfnt_off00011eea.bin
0cd798a6032dc23dc73d7a435270d2fc375c6c7d3eba265f52e39fdf706ee0bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11EEA 10616 bytes

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