Malicious PDF — malware analysis report

Static analysis result for SHA-256 803e5b12521bd855…

MALICIOUS

PDF

106.3 KB Created: 2021-09-07 04:16:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f0f7bb9f5ed252fc4c1420e1734ddcc6 SHA-1: c7b6fcfe6e9b0cf9e0019a24b1f11c42b5cfc91e SHA-256: 803e5b12521bd8555cd0fbd4dbe5a4e65efc88802ae47dd0466c8c3d2fc53d70
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is classified as malicious by ML models and ClamAV, indicating a phishing or trojan threat. It contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm or redirection scheme to distribute malicious content. The 'SE_CALLBACK_LURE' heuristic indicates the document may also attempt to trick users into calling a fraudulent support number.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 7

  • 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.
  • 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 https://huntic.ru/uplcv?utm_term=pathogenesis+of+schistosoma+mansoni+pdf PDF link annotation
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/315773b20399327703dd316711b5443c/paruvadadafasebexitem.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609e08c92203a---jakebazixagedapu.pdfIn PDF document text
    • http://eastendmediation.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rijunizekomoguwuvirow.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e86bab18ad7---jinasavatepigibesulorisa.pdfIn PDF document text
    • https://mps-india.com/userfiles/files/rerobewopidokixoj.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bdaf465088c---gituxuvabemab.pdfIn PDF document text
    • https://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/e531025539fe00d90dc1dec10acdbea5/najipebetidimiju.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1c7f27f435---73167761164.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1611d1a025f4b4---47319631361.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/20102673249.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e12638e20f5---tiruwarilufi.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607948b3479fb---musesi.pdfIn PDF document text
    • https://stradatextiles.com/upload/ckfinder/files/rirunomukesunodaw.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d4e969168---17478031932.pdfIn PDF document text
    • http://sevenseahotel.com/uploads/images/files/nutumako.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b4257a1dfb9---toturefenanenuje.pdfIn PDF document text
    • https://ccaquebec.com/userupload/files/53733815208.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613018e8a3ee9---zerevijenixejusujuwi.pdfIn PDF document text
    • http://5percent-design-action.com/upload/users/files/33796801035.pdfIn PDF document text
    • https://spitalmoldovanoua.ro/ckfinder/userfiles/files/82031143512.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/90208583678.pdfIn PDF document text
    • http://emeat.ru/var/files/lokavitex.pdfIn PDF document text
    • http://kubkao-kubpla.com/userfiles/files/nazudobelojadokijipupane.pdfIn PDF document text
    • http://adamslakeband.org/userfiles/file/tofijasomifelupexu.pdfIn PDF document text
    • http://abwessex.com/uploads/files/nunabuki.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_off00013a20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A20 18676 bytes
SHA-256: a39460563b96173f5526a6bfcc6e3eb23946edc2d2078724e5944227bdcf6ee0
font_01_sfnt_off000169e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x169E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000181fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x181FE 10920 bytes
SHA-256: 02ef638ea2f01cc21793264b6705bc7f8be097179712c59aea86b5ffad7b4e0d

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