Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e8cac3553a46ad3…

MALICIOUS

PDF

146.7 KB Created: 2021-06-30 07:35:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: d4c5dad27985f3c797a8a41e7ddd5fe4 SHA-1: 1f56146f44cb39dbc508c11f422a29b80f4b9a16 SHA-256: 5e8cac3553a46ad3b35fc050e930bc3d225ac757a8dac58c9d7eaa037f20e1bb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan. It contains numerous embedded URLs pointing to compromised WordPress sites and other domains, likely serving as a link farm for phishing or malware distribution. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the PDF structure and numerous external links suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://krisoc.ru/uplcv?utm_term=mta+monthly+pass PDF link annotation
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/6502d51de531bd25ce5467aa396bfe36/4702665126.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/g1j0410bjqcvrnmo750mdscsf1/naxejutimazuwakixulitujo.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/8663cc323046bf0cbd5d5da5a15de39f/85853130734.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb309c7889---99480421587.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/16075a33cbf5a6---16974715734.pdfIn PDF document text
    • http://2478.ru/admin/ckfinder/userfiles/files/wasoweborewubeg.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160952c0f79b11---35600669330.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609286dc7bf14---37197739833.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/6cd3b8f6a0c044a0b2aabc44ea5e60c9/jujarokadukuraw.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/jezawederofopaje.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f80bcc1454---kopiv.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/160718f995125a---59051392311.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/5e4f06d8cdb13ff11675dcf9795425fb/xurotegigaxumomufi.pdfIn PDF document text
    • http://tizianaiberti.it/userfiles/files/52205071351.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160773803a16b2---gesofavajalusopu.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/56619821659.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/96877789197.pdfIn PDF document text
    • http://thaoduocquyhiem.com/userfiles/image/file/86735005418.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16083b720a2dc3---vibademadixipisibagux.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1607a06482181b---detefujis.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/99092460182.pdfIn PDF document text
    • http://okuninka-biale.pl/userfiles/file/64555716512.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9e38dcb65---3042671508.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001de5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DE5B 18080 bytes
SHA-256: 1eac6735af93dabcaa1c428887e7883974081b85f3e1ef7f02ad36e722f38d6d
font_01_sfnt_off00020e60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20E60 10300 bytes
SHA-256: b8f8b0a833bb48056e915718709abefe6e1aa5bc4920027e88e699634098e774
font_02_sfnt_off0002256c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2256C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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