Malicious PDF — malware analysis report

Static analysis result for SHA-256 b395f6952f6be466…

MALICIOUS

PDF

69.7 KB Created: 2021-09-24 17:44:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 3f60968bd3c542317fa443c59ef6f0c3 SHA-1: 491720fc92fb6920aee9bdb8d8c9cadf352ced14 SHA-256: b395f6952f6be466e717a5fc30803deb2b61eaec5f7cfd8bde3dd3b003073e4b
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to compromised WordPress uploads and other disposable hosting, indicative of phishing or scam operations. The 'SE_CALLBACK_LURE' heuristic specifically identifies the document's intent to trick users into calling a phone number under the guise of a security or billing issue. While no scripts were directly extracted, the ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or a trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://onsijsselstein.nl/userfiles/files/7951252425.pdf In PDF document text
    • https://monographie.com/ckfinder/userfiles/files/tonazeputenukisazelifoxaw.pdfIn PDF document text
    • https://mgs-on-track.com/app/webroot/userfiles/file/kiwipubedilizevamuz.pdfIn PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/najarepakozoleb.pdfIn PDF document text
    • https://kattliv.com/kattliv/admin/userfiles/file/deduleja.pdfIn PDF document text
    • https://kettosallampolgarsag.net/imagini_ws/9617114565.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16130af575fbef---galuwakigezodasipe.pdfIn PDF document text
    • http://noithatmfc.com/media/ftp/file/51192569144.pdfIn PDF document text
    • http://swiftnb.com/ckfinder/userfiles/files/wazavofinelapuburotemo.pdfIn PDF document text
    • http://star-transform-moscow.ru/uimg/files/fofogifubaserivukumanija.pdfIn PDF document text
    • https://www.afoa.org.ar/backend/ckfinder/userfiles/files/tuwegozifawigivorudirav.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613730404a9e5---zadujuvogodenupolovo.pdfIn PDF document text
    • https://longhoang.vn/upload/files/zerixerivorexivef.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/satolujo.pdfIn PDF document text
    • https://speedwayinfo.hu/uploads/file/77372225612.pdfIn PDF document text
    • https://www.tcf.gov.tr/ckfinder/userfiles/files/segipirokodisexilatezajo.pdfIn PDF document text
    • http://www.mariabeckmann.com/fotos/uploads/files/xefuvo.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/b53a7e52b1dc29b7e2aa51df872a8953/tujejimiv.pdfIn PDF document text
    • https://genegurumiraclehealer.com/userfiles/file/11280893269.pdfIn PDF document text
    • http://mariekevanvlierden.nl/survey/userfiles/files/ponetiruteb.pdfIn PDF document text
    • http://ouhkpthaa.org/userfiles/73349421942.pdfIn PDF document text
    • http://kbautotech.com/board/datafiles/imagefile/sapuvigeziberotixivi.pdfIn PDF document text
    • http://biomax.shop/filespath/files/20210921111807.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16132b410b8e1d---37155360544.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dd6958d50b---14030301706.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=phone+settings+on+androidPDF 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_off0000b41f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB41F 14948 bytes
SHA-256: 4735f424e684b658076a111610ec1fdeba8abf6bf497c3dcbd4c54a0d23d57db
font_01_sfnt_off0000d986.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD986 10484 bytes
SHA-256: be8a1f3ca2760f154ac42f4c80e340cfd3f9b9a40d253d4b6b1ea6d6b41678ea
font_02_sfnt_off0000f11d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF11D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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