Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7bd11c298c59c02…

MALICIOUS

PDF

80.3 KB Created: 2021-09-16 14:51:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 087391ff8191e092f9386007ec88610a SHA-1: 87bbc296ad02ba16e4ed7a0fee5fb83dc339bac4 SHA-256: a7bd11c298c59c02ec8a50cce71b716ac7903a237e9dd02c7500781e46f7c79f
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. It contains numerous external URIs and link farms pointing to compromised WordPress sites and other domains, suggesting an attempt to redirect users to malicious content. The presence of these links and the overall structure indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://drafthe.ru/uplcv?utm_term=a+quiet+place+1+2 PDF link annotation
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613587e3e9a36---zubogaj.pdfIn PDF document text
    • https://barcelonacentromedico.es/files/galeria/files/pifosaramejumawupugiforet.pdfIn PDF document text
    • https://mashura.co/userfiles/files/girobi.pdfIn PDF document text
    • https://synodradomski.pl/userfiles/file/79847986209.pdfIn PDF document text
    • http://shyjjc.com/v15/Upload/file/20219244911684.pdfIn PDF document text
    • http://dental-forum.ru/userfiles/file/96468219720.pdfIn PDF document text
    • http://grafiport.com/userfiles/file/rikegunetavuwujati.pdfIn PDF document text
    • https://cobaltinc.org/userfiles/file/ravanefoguvute.pdfIn PDF document text
    • https://monographie.com/ckfinder/userfiles/files/63844228761.pdfIn PDF document text
    • https://datatech-int.com/userfiles/file/51372462953.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/911bd464f67f2b420339395eab642048/tusutuxadupafafabirafej.pdfIn PDF document text
    • http://gvs-russia.ru/admin/ckfinder/userfiles/files/2134763921.pdfIn PDF document text
    • http://hak-al.com/resimler/files/41536920809.pdfIn PDF document text
    • http://ranch.pl/files/file/91268998082.pdfIn PDF document text
    • http://suurelepa.ee/data/file/98206331002.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141a8594906b---folonetawovojabenedumolav.pdfIn PDF document text
    • https://ipekyolumedya.com/resim_galeri/file/zobezemobavunix.pdfIn PDF document text
    • http://teplorium.su/userfiles/file/39990827312.pdfIn PDF document text
    • http://leebyenghun.com/new/upload/board/files/90627475542.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/0f6270fec3be3aeb84f25b1539c85a26/57325537274.pdfIn PDF document text
    • http://abcbyspu.net/ckfinder/images_store/files/50551359160.pdfIn PDF document text
    • http://saimiri.name/upload/file/wakozusedi.pdfIn PDF document text
    • http://tt-ural.su/admin/ckfinder/userfiles/files/xosemitinolapudipexusukit.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_off0000d423.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD423 10276 bytes
SHA-256: b471993c6d311255e02682339acca40d61fba7bb1ab17469fcd3c5f624207039
font_01_sfnt_off0000eb7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB7F 18824 bytes
SHA-256: 85537f25f1a5156ba6a5976c303277d818dec653cd2b6778ebe59d648b3a096a
font_02_sfnt_off00011bfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1