Malicious PDF — malware analysis report

Static analysis result for SHA-256 82c1389719a82895…

MALICIOUS

PDF

68.6 KB Created: 2021-09-25 20:47:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0032f8dae90276a87448ce033e814d28 SHA-1: 593f7a6504e851cd0fe73b49fb05e65d65eddb62 SHA-256: 82c1389719a82895637837a5c3d76ed4ca106283c4e97c167dbf0fe9e5d654be
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, with heuristics indicating it functions as a link farm pointing to potentially compromised WordPress upload storage and other disposable hosting. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf. The presence of numerous embedded URLs, many leading to PDF files on various domains, supports the link farm and potential phishing or malware distribution vector. No scripts were extracted from this sample, but the overall structure and heuristic firings suggest a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://araulmor.tel-cor.com/images/library/file/91795119062.pdf In PDF document text
    • https://chambres-hotes-aube-bleue.fr/userfiles/file/puborirawenebam.pdfIn PDF document text
    • http://scuolascifondocortinadolomiti.it/userfiles/files/sixud.pdfIn PDF document text
    • http://vxclouds.com/userfiles/file/32465429566.pdfIn PDF document text
    • https://artofsurfing.com/preview/ckfinder/userfiles/files/pagef.pdfIn PDF document text
    • http://dlevitin.ru/fck_editor_files/files/juderiranunuzijapokiwin.pdfIn PDF document text
    • http://classicalgardenfountains.com/uplds/file/fepibazivunufipigamezi.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16130251cb07bb---sidesonedobugarowewugiki.pdfIn PDF document text
    • http://2478.ru/admin/ckfinder/userfiles/files/nesorotukeserizijev.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161464ab6bb732---wowilakonodixipe.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/f07cafe4878fca40769f755adc457ae1/wanomotidexuvegudono.pdfIn PDF document text
    • https://gplacestracker.com/userfiles/file/dapuxilup.pdfIn PDF document text
    • https://nieruchomosciturystyczne.eu/files/file/44119980026.pdfIn PDF document text
    • http://eastcoastbiker.de/sites/default/files/file/79448557630.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/4m5m9sftd4mokkhhnnhvb4846o/bejipukawezil.pdfIn PDF document text
    • https://33mobility.net/uploads/files/35457150149.pdfIn PDF document text
    • http://romento.com/uploaded_files/userfiles/files/rutabazokejemitime.pdfIn PDF document text
    • http://leeclinic.kr/userData/board/file/40816524917.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/4a5327551d429faf73645b108188b48c/58913165413.pdfIn PDF document text
    • https://apsco.ly/userfiles/files/dibetar.pdfIn PDF document text
    • http://elitvorota.ru/f/file/motalolagif.pdfIn PDF document text
    • https://casabresciani.it/uploads/file/95876673882.pdfIn PDF document text
    • http://artepcb.com/upload/files/84284495863.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=football+games+unblockedPDF 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_off0000afa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFA3 10828 bytes
SHA-256: 138d00411ac7c733f53d0833960de9fc97503e3c2973856d11f48f2e4dbc2444
font_01_sfnt_off0000c87e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC87E 14440 bytes
SHA-256: 67d6646affb2d157e922336f65089818f5d4d48d75e891b7c259bed5460fdb2c
font_02_sfnt_off0000eccf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECCF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.