Malicious PDF — malware analysis report

Static analysis result for SHA-256 6abeb4488985ff3c…

MALICIOUS

PDF

83.3 KB Created: 2021-09-18 01:01:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 35cc42f1d53a7c525bcb35a632168d34 SHA-1: 244cf8fcc34e6c477216aa58a6658d95c58c2353 SHA-256: 6abeb4488985ff3ca07ce548feec015c70942b76898d3ab6444e1424221fde44
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of external URI links and link farm heuristics supports the attack pattern.

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 http://eros-arena.name/eros/userfiles/file/sozugitala.pdf In PDF document text
    • https://capitalsyndic.com/userfiles/file/30938456271.pdfIn PDF document text
    • http://holzweiss.at/wofepuxa.pdfIn PDF document text
    • https://teamcode.net/upload/files/fexumabunikilajejowe.pdfIn PDF document text
    • http://aldobini.it/userfiles/files/niberivebojefiludobusegaw.pdfIn PDF document text
    • https://gabinetpro.pl/kosmetyczka/krakow/files/bobilitipuwet.pdfIn PDF document text
    • http://moscowfashion.net/content/xuploadimages/file/16335845299.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/kimiwebebanogidemukodi.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/d834b611a1fe7f3429828ead7bd639ce/wizuzupuse.pdfIn PDF document text
    • http://pomocnaukowa.net/Upload/file/95833889066.pdfIn PDF document text
    • http://master-vin.ru/files/file/56757051569.pdfIn PDF document text
    • http://caythuocdangian.net/images/files/gavux.pdfIn PDF document text
    • http://gleb777.com/fck_upload/file/xejafisobumo.pdfIn PDF document text
    • http://thevisionkharj.com/userfiles/files/losodobame.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/ebd62b8ffb1555d4eb945e10aad98598/xopolifusubikewunos.pdfIn PDF document text
    • https://mobilaide.com/upload/editor/file/jeguwibevakelagifunasumam.pdfIn PDF document text
    • https://sieuthimayphat.com/ckfinder/userfiles/files/47235570259.pdfIn PDF document text
    • http://kxzyjy.com/CKEdit/upload/files/98316319349.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/a0d0ddf39bb8a6f87e623228a7a85648/suxoxiduworibisunanu.pdfIn PDF document text
    • https://mosaicopeoplecorporation.com/ckfinder/userfiles/files/37480033670.pdfIn PDF document text
    • http://vet-spb.com/userfiles/file/pevovezufememov.pdfIn PDF document text
    • http://mestav.sk/uploaded_images/file/jonidilunuwufavuk.pdfIn PDF document text
    • http://fencefactoryny.com/userfiles/file/puwuzobaz.pdfIn PDF document text
    • http://harlit.com/upfiles/file/9193738932In PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=kotor+android+controllerPDF link annotation
    • 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_off0000e0f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f90c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF90C 10184 bytes
SHA-256: 38616be4767baee0fe577b229a685b916034bff4fda0d443d0486f831765badf
font_02_sfnt_off00010fef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FEF 18408 bytes
SHA-256: 114a7c378bd2a350d8dfc09409fae62ffcf804839ce3b39f7f7f0b82d8d9dfe5