Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f4280c1077bf3a1…

MALICIOUS

PDF

76.5 KB Created: 2021-09-02 01:15:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2279e5e986f9b682ea50f9027955c4ad SHA-1: b1b26c92fe79c12b2e637f72c1b6d64cc13b8539 SHA-256: 5f4280c1077bf3a1bd7f608fb38b4e41724dbdf013986d320faeffd8821cf7b5
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised WordPress upload storage, suggesting an attempt to host malicious content or redirect users to phishing sites. The presence of numerous unknown URLs further supports this, indicating a broad distribution effort. The document body is heavily obfuscated and unreadable, providing no direct textual clues but reinforcing the suspicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160891236d16ed---zelebadenusoziwe.pdf In PDF document text
    • https://fotofidelity.cz/userfiles/file/bivonujepewik.pdfIn PDF document text
    • https://biovuspharma.net/userfiles/files/libovof.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/c6ca84f34b8346c9455ad0d42be53ad8/25815285905.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/dtpocci2tlqqhu6tlph6slmrc0/razowofejezetuge.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/35038247259.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/9e14b96f84b6897b6fb8d53acbfc0a1e/kulen.pdfIn PDF document text
    • https://szelvedojavitasmiskolc.hu/files/files/solonutoxawe.pdfIn PDF document text
    • http://xdata.pl/app/webroot/img/ckf/files/dutuzovejofilixa.pdfIn PDF document text
    • http://camwater.org/media/files/safujidul.pdfIn PDF document text
    • http://autosvilar.com/uploads/ckfinder/files/nulodezemawobunikovoma.pdfIn PDF document text
    • https://belitour.ir/basefile/belitourir/files/jerolaf.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/24e2e4c107c0a6ad84edf5d3e4d9e436/99510442334.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a539892d47e---tapasasevobufasexe.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/bdc3e9e66116affcae4c09e5fd9bb19e/1819572261.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e09ea4c6d3a---59024610421.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1608632a71ef19---53829708340.pdfIn PDF document text
    • http://tunecharts.com/userfiles/file/91969830195.pdfIn PDF document text
    • https://safrano.pl/userfiles/file/zebefetimeputuxekowo.pdfIn PDF document text
    • http://tea-ra.com/user_data/upload/save_image/files/mefejuroxagaxigudoxov.pdfIn PDF document text
    • https://kurek-rowery.pl/user_pict/file/jopasesuvapexunadamer.pdfIn PDF document text
    • http://yesilderecine.com/admin/editor_resim/file/40548862218.pdfIn PDF document text
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/fe7ea70ef9375565e4f90a3584641dd8/84328558575.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/8cb42d012cb50850a95bbcf580bede8a/32207378563.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=can+you+cash+someone+else%27s+check+at+your+bankPDF 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_off0000c845.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC845 10912 bytes
SHA-256: 8cac1cccb571fd5918d097c869858c788f02969f70952679d7d811286862d6fb
font_01_sfnt_off0000e17c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE17C 16252 bytes
SHA-256: c26ff2aa32b38ab6789ef1d4d6b73f7b4b076b581f9711af1e9427abbcb501c0
font_02_sfnt_off00010b6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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