Malicious PDF — malware analysis report

Static analysis result for SHA-256 33d7041e6494b679…

MALICIOUS

PDF

71.5 KB Created: 2021-09-21 08:00:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b634c85773d062d87b44a42b0d903dda SHA-1: 7071f43f9c178f519dc29fccb42d5672fc8f5033 SHA-256: 33d7041e6494b679763e3f01c3b21ce6dd8ea156b53d8de54e1353f2d6fda5ce
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and ML classifier flagging further supports its malicious nature. The primary attack pattern involves luring users to external sites via these links, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://inwebjor.ru/uplcv?utm_term=gta+5+increase+money+cheat PDF link annotation
    • http://www.hausman.eu/images/wyswig_images/file/pekukalivixa.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/931aac7f7306154b09f10e33d2289d94/70637770743.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161321bf4bd6e8---lujabuxige.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fbfe603dd2---69350239567.pdfIn PDF document text
    • http://greenearthgardens.org/userfiles/vamajebikowigikesa.pdfIn PDF document text
    • http://uteambio.com/upload/files/42332090305.pdfIn PDF document text
    • https://livre-d-art.com/ckfinder/userfiles/files/kogamitenixoxoruvof.pdfIn PDF document text
    • http://apicn.net/upload/files/27174739824.pdfIn PDF document text
    • https://nhomphuongnam.com/upload/files/tevosokaroja.pdfIn PDF document text
    • http://ndc-group.ru/uploads/files/60162153400.pdfIn PDF document text
    • http://adacu.org/userfiles/file/20210909222824.pdfIn PDF document text
    • https://tyeetomsfishing.com/userfiles/file/totokijopimon.pdfIn PDF document text
    • https://artistaone.co/userfiles/files/99669821312.pdfIn PDF document text
    • http://evaemlak.com/userfiles/file///94491418275.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16133fd0a719c0---garaletubataletu.pdfIn PDF document text
    • http://imosa.asia/uploads/files/202109211207094367.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/ed84fb0225d56d16af7a7f4516e53473/wopafizikaz.pdfIn PDF document text
    • http://spiregene.com/image/files/20210906_025213.pdfIn PDF document text
    • http://etalentlink.com/uploadfile/file///2021092109564441.pdfIn PDF document text
    • http://parateam.cz/file/zixunulavudazedof.pdfIn PDF document text
    • http://www.naturhalles.fr/fckeditor/userfiles/file/susurodozorojisaxoxonujep.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/h8go5kc6o2l4qav7pd6gck79m4/zovosorowa.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130585c3e14e---wudojujipividizarifu.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_off0000b5cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5CF 16480 bytes
SHA-256: b52435334048d4bc5fd5f0685e70934f43dd04222181bd15104eaaea3ffd1eb3
font_01_sfnt_off0000e002.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE002 10736 bytes
SHA-256: 5e504fb8cb207220b36a9c4849868bbe697a7984c52b4ae6c0cd7eb73f16974d
font_02_sfnt_off0000f8a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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