Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5f6a41069316079…

MALICIOUS

PDF

69.7 KB Created: 2021-09-29 12:18:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 3c80cfa95e911d2392c52768e365ea5f SHA-1: 40d61f8e522a329a9bc1fd990ef480e58404a206 SHA-256: d5f6a41069316079fc31dcb88b1189a61e1b4466a19e616ce1ed27d9ab25cec6
176 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a large number of embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The heuristic 'SE_QR_LURE' also indicates the document may instruct users to scan a QR code, a common phishing tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://queure.ru/uplcv?utm_term=silent+hill+origins+ppsspp+download PDF link annotation
    • https://anthonygillant.com/userfiles/file/92907242220.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/xesixozivusoteje.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/srd373r1dtusp8te8b4iol6ui2/vozavadovoru.pdfIn PDF document text
    • http://fabiocaronearchitetto.com/userfiles/files/xoferowemide.pdfIn PDF document text
    • https://betamachinery.sa/other_files/File/62249622758.pdfIn PDF document text
    • http://elosc.com/upFile/file///ITX202109202259226155.pdfIn PDF document text
    • http://vidol.nl/userfiles/file/tugegux.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/xegezorewune.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/5104001163.pdfIn PDF document text
    • http://mexvp.com/ckfinder/userfiles/files/nonakepelufakovudonutokad.pdfIn PDF document text
    • http://school19-zav.ru/userfiles/file/70258281456.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/bia8p4ierbq0v9p16avqcdcnv1/kigaxut.pdfIn PDF document text
    • http://zajazd-broadway.pl/galeria/file/59231123317.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/c06eb71be7b547a82c67e0ec5f47fbec/35317430331.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/tozefujafapaviwu.pdfIn PDF document text
    • http://americansemitruckparts.com/d/files/gigesulamunudiraleru.pdfIn PDF document text
    • https://zweefvlieg.net/userfiles/file/xumuzagaxu.pdfIn PDF document text
    • http://alacarte-grafik.de/userfiles/file/bamuvufebamuwubi.pdfIn PDF document text
    • http://quiltingacademy.com/fckeditor/userfiles/file/xinosipufaxidibejidizawe.pdfIn PDF document text
    • https://sabagdasarov.ru/upload/file/53267699001.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/dekulimabavazuselabup.pdfIn PDF document text
    • https://justforjetscatering.com/userfiles/image/files/89540313431.pdfIn PDF document text
    • https://www.antoniopopolizio.it/ckfinder/userfiles/files/90720523483.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d2a4ce97ea---47063114107.pdfIn PDF document text
    • http://bdsps.org/slbdavbatala/userfiles/file/kuxaniwi.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_off0000b151.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB151 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c968.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC968 10832 bytes
SHA-256: 450746a6c16572066d373e9138ff238062789d0f08f2463ba297d8f7258d56cc
font_02_sfnt_off0000e222.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE222 15596 bytes
SHA-256: b5ecc20e7c3b202de32bc02920638539a1720266a2bc654f8963f1472966fc47

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