Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cb6416583ab226f…

MALICIOUS

PDF

86.2 KB Created: 2021-07-13 11:52:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 22b4a4e8778eb3685dd26d7c98a9b09a SHA-1: fb87be297ce94979fbb2389da8f702ba145f49fc SHA-256: 8cb6416583ab226f0df43a20abd62ff4d87ffd4456406bb9099748c50cb1714c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm designed to redirect users to malicious content. No scripts were extracted from this sample, but the presence of many URLs indicates an attempt to lead the user to a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://chcial.ru/uplcv?utm_term=custom+online+cards+against+humanity PDF link annotation
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/5f131d9f0caa2115238cd924b73d5425/65075189074.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/c99321f1b6c3d758a2e46de3ea142091/safegesaxekaxometedikolaf.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf64e78dab---kavejom.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/favejukijavikagavawolam.pdfIn PDF document text
    • https://goldenapp.net/file/lepotolaxowesabamor.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/57630640259.pdfIn PDF document text
    • http://gallery4walls.com/upload/editer/file/vawajezaxarepakelisaziti.pdfIn PDF document text
    • http://lorichphoto.com/pictures/file/lobikisaxujo.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/87220671961.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e673e8e521---28615631124.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1608ced52eb259---98364248220.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/1a3ca99c052a924196d4dd86fdbbc932/tufepavunufalidokepijedin.pdfIn PDF document text
    • https://opuntia.eu/wp-content/plugins/super-forms/uploads/php/files/1e3a3e4b352d41ca95edd4b60566d503/8755857264.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/or9kaelq0tb22g129btmrv42n6/jedalekazimip.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/fd360080bb57fc1249a799d3865f1226/veboruzakamovug.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/nixinibosawom.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/ca4756df9a166c68c77df3855dd6e6ac/nakisagafofa.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160afa4f57516e---96904680721.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160804f81de393---rokakot.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/b54a94904ccebd2a6a73e6eaf32e56f9/75168032550.pdfIn PDF document text
    • https://nilsahost.com/calisma2/files/uploads/gunifuzofezebumubidis.pdfIn PDF document text
    • https://irisapp.cn/uploadfiles/fckeditor/20210513/file/16208466571442.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_off0000ebdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBDD 17728 bytes
SHA-256: 66da6195b7cd63a1aeaeb1cb38e2cc84c456d26d06fd7e2bbddd11bf158400c7
font_01_sfnt_off00011a0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013225.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13225 11060 bytes
SHA-256: f7c9a8cc3ca123f5d28d5693a9a925755e9ac9731579f20f20183337dbd61311

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