Malicious PDF — malware analysis report

Static analysis result for SHA-256 46d78393aed7a64d…

MALICIOUS

PDF

98.4 KB Created: 2021-08-19 19:56:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4cce6f955a440f857de2e9dc80d01e42 SHA-1: 7e2e93a14c6ae52fd83d9bc6a16568769bb1f9e7 SHA-256: 46d78393aed7a64dc580051b9e3dc3490e472c6e91cb4ca5ec1f11b7f172cbac
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics, including ML classification and ClamAV, indicating malicious intent. The 'SE_CALLBACK_LURE' heuristic specifically points to a callback phishing or tech-support scam pattern, where the document likely prompts the user to call a phone number. The presence of numerous embedded URLs, many hosted on compromised or disposable domains, further supports the malicious nature of this file, likely serving as a lure to initiate fraudulent phone calls.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9800

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://tataservice.it/userfiles/file/53417535718.pdf In PDF document text
    • http://somsit.com/ckfinder/userfiles/files/bejunogopawisera.pdfIn PDF document text
    • http://tremonttemplemacon.com/clients/862779/File/72290127800.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c3dd83ba0c---kunitomevimi.pdfIn PDF document text
    • https://thefertilizergranulator.com/d/files/2044396307.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/24351339505.pdfIn PDF document text
    • http://santabruna.cl/upload/file/94854337721.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cfd640cc3c---32271681174.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a3ee8b81ed0---50215315155.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2536875dd4---14335049855.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e8b81b718---kituxonaw.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608a932e7c216---vosatiwelaberaloxazefugux.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c147052deaa---51756997951.pdfIn PDF document text
    • https://ylwlgwadmin.ylwl.cn/upload/files/jowugik.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5917131539---93184024357.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/qaoa3bvogofqk5apfjdblsq8v6/80952947368.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608168407d9f4---64428287837.pdfIn PDF document text
    • http://shacklefordlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bexupute.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/80b08bf6150d5d2781332b06c2dd8f5c/41701996151.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b304f821a3d---namadatukizibenojesugo.pdfIn PDF document text
    • http://physiotherapy-warwickshire.com/user_file/file/bakog.pdfIn PDF document text
    • https://cosmopolitanhotelbg.com/uploads/wysiwyg/files/lusekogilax.pdfIn PDF document text
    • https://helicopterleasingservices.com/userfiles/files/6022438259.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606c90471fad8---pakunat.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/3d57013ef7811dd3b8d7a51d7d5cf5a2/zijomonozewo.pdfIn PDF document text
    • http://irinaburmistrova.ru/files/jeroj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=yasin+suresi+t%C3%BCrk%C3%A7e+okunu%C5%9Fu+pdf+indirPDF 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_off00011906.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11906 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001311d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1311D 11252 bytes
SHA-256: 4fea8d73ce7776b4f3c87b67426092137f4067f488993d5dbe6be1ec75cdc385
font_02_sfnt_off00014ab9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AB9 19856 bytes
SHA-256: a9ec8566a15fd6119c947c510828ca0d1b3bb20aa1f0e46e9b014f1d530f2812

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