Malicious PDF — malware analysis report

Static analysis result for SHA-256 6efb43a53c0d2b87…

MALICIOUS

PDF

83.9 KB Created: 2021-09-17 07:32:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 363fb3d3b66064c9ebb6ecf24234a3e5 SHA-1: 6d6bab33d5ee3ed7b3011f33ad283e673b03e9f2 SHA-256: 6efb43a53c0d2b87e2262b8858a1537450f4b324917cb0941acae93931a423a8
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs that point to various websites, including those hosted on compromised WordPress installations and disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of link farms on potentially compromised or untrusted hosting suggests an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://oniceh.ru/uplcv?utm_term=adding+fingerprint+to+android+app PDF link annotation
    • https://dukeofmarshall.com/ckfinder/userfiles/files/73257143870.pdfIn PDF document text
    • http://coral-travel66.ru/admin/ckfinder/userfiles/files/62004947546.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613530e875c44---sotetifosek.pdfIn PDF document text
    • http://dietaltop.com/userfiles/files/96803107170.pdfIn PDF document text
    • http://mos-craciun-inchiriere.ro/fckfiles/file/vasexefoxoxinava.pdfIn PDF document text
    • https://cargotavio.ru/files/file/biximabe.pdfIn PDF document text
    • https://acp-luxusingatlanok.hu/ckfinder/userfiles/files/34309576886.pdfIn PDF document text
    • https://nk-sostanj.si/files/file/morironenaz.pdfIn PDF document text
    • http://kimsanghun.com/upload/userfiles/file/20219121111142606.pdfIn PDF document text
    • http://mtsp.by/userfiles/files/88472192017.pdfIn PDF document text
    • http://mingmitrcoffee.com/user_img/files/xigiron.pdfIn PDF document text
    • http://xmzhj.com/UserFiles/file/bomukegoxevopugobudo.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/f1bb12fb89d197c7db7ddfb18960cfab/govowezabenazutinodu.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/68090880123.pdfIn PDF document text
    • http://nhatnguyen.vn/media/ftp/file/sawilope.pdfIn PDF document text
    • https://ropaalmayoreo.com/images/userfiles/file/9537896029.pdfIn PDF document text
    • http://prvugkh.ru/uploads/files/vukoxabikakefitunozikev.pdfIn PDF document text
    • https://bhopalliteraturefestival.com/mpsdp/uploads/files/tekemizupuxep.pdfIn PDF document text
    • http://info56.ru/userfiles/file/68243382641.pdfIn PDF document text
    • https://bodymart.in/ckfinder/userfiles/files/juvabirefukigokepep.pdfIn PDF document text
    • http://architettodrabeni.it/userfiles/files/92958669345.pdfIn PDF document text
    • http://nenayu.com/filespath/files/20210917050223.pdfIn PDF document text
    • https://guineaservicesproviders.com/gsp/files/bolowo.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/guvebelazexa.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/2e58b64121cdeb9f209e8fed9e1e5359/31070843071.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_off0000e587.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE587 10440 bytes
SHA-256: f89156af6aa10b836809ea7865fbe3b83cac69ace53a40e39568ea1bbdde1d94
font_01_sfnt_off0000fd13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD13 17168 bytes
SHA-256: ce560b906f938273c23a2cdef16a5c3ea44be4aa43c8fee4088a607ba1c75a8d
font_02_sfnt_off00012989.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12989 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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