Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc193fb4a5bbbfac…

MALICIOUS

PDF

89.6 KB Created: 2021-08-25 03:18:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9685d5b0f9ec1595d0d180ad661d417b SHA-1: 9ad40cb30c92d9ce486edb6c74152a82df79bbb7 SHA-256: cc193fb4a5bbbfacda09b404fb583898f6bb51896798440935a113756e8a8085
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous embedded URLs that form a link farm, pointing to compromised WordPress upload storage and other disposable hosting sites. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9884

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://laborke.ru/uplcv?utm_term=rare+and+well+done PDF link annotation
    • http://imaginove.eu/data/Files/21259881588.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160c677631556e---bukisexadej.pdfIn PDF document text
    • http://sylvianapoles.com/clients/e/e6/e63d90d46a840f0b3195f531cec11f6e/File/75876723410.pdfIn PDF document text
    • http://cmuniontravel.com/userfiles/file/jirikezutegufi.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086983e2325f---23061318896.pdfIn PDF document text
    • https://kga-am-adlergestell-ev.de/kga/ckfinder/userfiles/files/dozipazigovabutelivator.pdfIn PDF document text
    • https://thegioidongphuc.net/ckfinder/userfiles/files/6361446197.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/70511728900.pdfIn PDF document text
    • http://krikrik.ru/uploads/ckfinder/files/nusoravadulapan.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/lbi5e3jrgoahu7rsutlgd0k0oo/kemizevijatewepavifef.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fc5fa568fe1---24342570319.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16079982a17e0a---josuradolesawajonakuvepit.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/lv98ubc1oqlv9c1j92sdgq7ijn/90241755037.pdfIn PDF document text
    • http://lammensfilip.be/uploads/files/74562646117.pdfIn PDF document text
    • http://sibmetiz.ru/upload_picture/siwesar.pdfIn PDF document text
    • http://koreanhotpot.com/uploads/files/rejarukovaxadilud.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/62862414290.pdfIn PDF document text
    • http://chinhlytailieuluutru.com/media/ftp/file/2853710501.pdfIn PDF document text
    • https://mfdesign.hu/files/file/nopipogor.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-7-7/20210707214550231608.pdfIn PDF document text
    • http://augsburger-dartliga.de/uploads/file/76098472086.pdfIn PDF document text
    • http://thevelascofamily.com/clients/11614/File/53873223454.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/jt34t2o5vg9231cltljfbid4k5/madesufilotekidepenojimow.pdfIn PDF document text
    • http://qhchemicalsfeed.com/upload/files/ledupororegivusiwa.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6d6c532b2---wazurawojiselo.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/kodgq0d4sa108gp2puprtush0m/46500416190.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_off0000fbb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000113c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113C7 10012 bytes
SHA-256: 0a205c530f95507feaff0fc42b6aa0f966fe010923d3b29bf27e57941976bc62
font_02_sfnt_off00012a22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A22 17628 bytes
SHA-256: 8accdc3cc0651ad4500a91f56d881d5a8cba491b8c301c27e2b2592e7a2d273d

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