Malicious PDF — malware analysis report

Static analysis result for SHA-256 fff5104d4cc408c1…

MALICIOUS

PDF

125.8 KB Created: 2021-06-26 01:24:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 97ba2c626a8fe36aff8c9a21d07bc57d SHA-1: a5b4e2a25f213a77ee782a4b79eb60ae4faba5e5 SHA-256: fff5104d4cc408c13ee354df3bd1203813b4158651f8b2d5db48626002059bcd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable hosting, likely to redirect users to malicious content or phishing pages. The presence of embedded URLs and the nature of the link farm suggest an attempt to lure users to external malicious resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://queure.ru/uplcv?utm_term=meaning+of+zikr PDF link annotation
    • http://candientuvibra.com/images/file/tevox.pdfIn PDF document text
    • http://simonide.org/userfiles/file/wepogufirarizuraxadum.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607269a9a04e4---wisedezobozalojurimo.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/43bce82cb490d77cd83c78df0fdaca46/42691982821.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607dfa25bcd1e---vovonubidiwix.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7c1bd2bfa07854062892894b86c6c702/73760102342.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/2u4ohrfrfr4402tr8c5g41p812/fakibudoxoralowele.pdfIn PDF document text
    • http://donkaew-furniture.com/ckfinder/userfiles/files/pafujezotasubafuluwad.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b15d5c46c6d---taxuvi.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/1608b929b0b875---67987214142.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160770962b7319---rewinutexijuson.pdfIn PDF document text
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/88465364401.pdfIn PDF document text
    • https://narimasu-chintai.net/jcfiles/file/pazebopijevenixotoruga.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bab8bff3ffa---gerenipenikodejajofi.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/v0kjl1a857fmcnurt18rbq7g15/35724825398.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/cf6522gc1rq9q1m381s9j5nh14/vixiwetazujap.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/1k036ubp3l96mc1kvuukde0v72/jurunapexexuw.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/33083952621.pdfIn PDF document text
    • https://petala.gr/userfiles/file/jisaguroranubakadu.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160b2d114d9ed2---ritivilevixenaliz.pdfIn PDF document text
    • http://rentbucharest.net/images/userfiles/gesavatuliwoxezik.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/8e78e67e3d7676b8788ad5ee5afb25ac/milivulafokazilepetikemi.pdfIn PDF document text
    • 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00019fe2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x19FE2 27820 bytes
SHA-256: a8dc91969a886517e537fbdc0c3a4323033e8d5cceaf05f4b37f5753dc1e07ac
font_00_sfnt_off000153cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153CC 21080 bytes
SHA-256: 065ff16dd23dcdbf87c7b839d1aa8165a66998b1cefd764da560121bfe1325cd
font_01_sfnt_off000188d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x188D5 10220 bytes
SHA-256: c54dfa0fac9a9b105ee3703e68a18b2e64eaac3d05db2f303a6f9309569ac16f
font_03_sfnt_off0001d20a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D20A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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