Malicious PDF — malware analysis report

Static analysis result for SHA-256 2af682786de4a620…

MALICIOUS

PDF

83.2 KB Created: 2021-07-16 08:23:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 86ccff3598485f770e83ccfb07ab16ef SHA-1: 8d7171e72bc985b0b02225f673240f60dc25ccb2 SHA-256: 2af682786de4a620873de0db5aa0162e152af9eb445eddb351eeab2ba0a0eacb
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised WordPress sites, indicating it functions as a link farm. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' confirm this behavior. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pistant.ru/uplcv?utm_term=reet+previous+year+paper+level+2+pdf PDF link annotation
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/861a1c284f3c25e8cb3211cfdeba2d70/texijuxevonuxugowuw.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/d28d5b66097b5dd1711559418f5e0561/92251157796.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160edb832ad3d9---nixituz.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160967a2cd5217---zikovevaguxexepu.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/40b4dc8d7303b89680c9138656e29885/7660625954.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9a231da7b---78145865796.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/0dc47fcf0570065569caedef8324eb77/47578454981.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/16243661684397.pdfIn PDF document text
    • https://smobiil.eu/userfiles/files/mewomuvupejetefudezona.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bba2a2a58cd---nosaxuk.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608716b31bfb1---22279062452.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088587e65f55---16774117702.pdfIn PDF document text
    • http://toeicspeaking.net/_UploadFile/Images/file/vutefebodovavidegiwoluv.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/a12c346e90474f3a267cf67a0fc1e210/27492629196.pdfIn PDF document text
    • http://bindashnews.com/userfiles/file/21611280171.pdfIn PDF document text
    • http://ghibms.com/userfiles/files/6718435264.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/810100f4e5bf8c1a1d4a41c29910c7a9/zavefukize.pdfIn PDF document text
    • https://jaiminsales.com/ckfinder/userfiles/files/31453298900.pdfIn PDF document text
    • https://paymentor.nl/uploads//file/62022969751.pdfIn PDF document text
    • https://nmcs.ca/userfiles/files/gamexusas.pdfIn PDF document text
    • http://vietxetai.com/wp-content/plugins/super-forms/uploads/php/files/ht7jjnvcmmjflnjthdfoupb9sd/xefoxodibot.pdfIn PDF document text
    • https://groupunsur4.com/contents//files/vusonasitonid.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/sh5gtjia6ier0esps39999d4u6/2243309284.pdfIn PDF document text
    • https://alutat.com/data/file/72668085609.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_off0000e272.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE272 16808 bytes
SHA-256: 2b501df1df0029efd099257eacd273c1bb9bde2c677b577992dc76be2d9af103
font_01_sfnt_off00010dfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012614.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12614 10832 bytes
SHA-256: aa2564d877594a2f3cb4942b8f78923e2e7c12bd046a6b1ed9ae5bea446c0b2f