Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e67b4867cfd0756…

MALICIOUS

PDF

89.6 KB Created: 2021-08-10 05:29:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 3698871d78b1f563f249c534bedfbf9d SHA-1: 49d1bff68120084f648f06df194056d8e393afe3 SHA-256: 9e67b4867cfd075689c0e4a64a1ec8e71a5779c91ebef868f947b11253293bf8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/129c4ed271ca263e3b4d5729b74dee14/bobogifedo.pdf In PDF document text
    • http://charivne.info/images/file/10318506386.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/vdt3cr2jqsm4c2kp5h1rec0b7c/73583059657.pdfIn PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/21072328738.pdfIn PDF document text
    • http://gaytonfa.com/upload/files/rafemimux.pdfIn PDF document text
    • http://ticketsperiodico.com/galeria/files/depirukatusaz.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073e9d9c45c5---71918149140.pdfIn PDF document text
    • http://thedreams.cz/files/92022150877.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/zelagajozepubuzasodepalu.pdfIn PDF document text
    • http://temple.mo/userfiles/file/murugubimopid.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1609a4c6fc677a---muxazepeza.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608fc5c460fda---najokukeribezofetir.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bc2063298ca---4483611828.pdfIn PDF document text
    • http://wohntraumgmbh.at/1101103381.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/qb1uksvql4ml75c654mbrppca0/vabinigesediteboxu.pdfIn PDF document text
    • https://activepymes.com/pub/file/zidemigetopubani.pdfIn PDF document text
    • https://moto-trend.cz/public/files/fck/file/24998202205.pdfIn PDF document text
    • http://ailizia.com/userfiles/57956617983.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/6182bb0209ddd487ac932e7d6de97493/xobarusese.pdfIn PDF document text
    • https://diaochue.vn/userfiles/file/46382147358.pdfIn PDF document text
    • http://hosungtour.com/FileData/ckfinder/files/20210528_8F41E66510488518.pdfIn PDF document text
    • http://klinok-saintp.ru/files/39806510152.pdfIn PDF document text
    • http://planetamama.ru/files/file/88939835871.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=mission+impossible+4+download+in+hindi+480p+filmyzillaPDF 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_off0000f775.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF775 17488 bytes
SHA-256: 21051f06b6ac6b12c6a945cf185315d7c451f44502dc49e4ddd378ab7cc470eb
font_01_sfnt_off0001251f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1251F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013d36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D36 11368 bytes
SHA-256: 0415457d7e98a85858f70265c6362e5c0daa09bf8ec68ab64d4bba63be13f8b5

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