Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9cbde9cea644e5c…

MALICIOUS

PDF

89.2 KB Created: 2021-09-06 03:56:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c2a08dc05850347f5e45a5ec7581eef0 SHA-1: 76c3303d3514a09a739a76e6d65709c333091115 SHA-256: d9cbde9cea644e5c7576493f9801005fa40f0c5a18ca0be8e0bc7f04fff18fb3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, likely intended to redirect users to malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate attempt to manipulate search engine results or distribute malware through a network of links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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.
  • 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://mayingiabao.com/upload/files/68393916295.pdf In PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d49f0a72874---kubojigetebirujaxo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c532bc8eef3---92749306497.pdfIn PDF document text
    • http://immobilier-valence-agen.com/userfiles/file/14437528229.pdfIn PDF document text
    • http://secretlove.ch/ckfinder/userfiles/files/57499884885.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/3f99ce7f388b11017b9a9f4206f0344c/75203010809.pdfIn PDF document text
    • http://yejida.com/userfiles/file/46321141132.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16123b57e100a0---gifibo.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a02227e11c2---14597828703.pdfIn PDF document text
    • https://semangkabiji.com/contents//files/jexefogot.pdfIn PDF document text
    • http://bangkokmagnetwire.com/ecodev_test/image_system/files/39714952419.pdfIn PDF document text
    • http://giustofiori.it/file/dawovajomu.pdfIn PDF document text
    • http://ydis.kr/userfiles/file/021647139689.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071a70895d5e---bovopukokanaxowaxig.pdfIn PDF document text
    • http://life-homeshop.com/asset/uploads/files/34111885012.pdfIn PDF document text
    • https://nutstudio.it/userfiles/file/52859131355.pdfIn PDF document text
    • http://yogathoitrang.com/quangbasanpham/app/webroot/upload/image/files/nebejut.pdfIn PDF document text
    • https://typeone.com.my/ckfinder/userfiles/files/15726389212.pdfIn PDF document text
    • http://trips-in.com/ckupload/files/22124915621.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/barokefizazuz.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c290817cff9---87547379605.pdfIn PDF document text
    • https://lapalettedesarts.fr/gestion/file/nizamewogusojuropadul.pdfIn PDF document text
    • https://distriparkbotlek.nl/userfiles/files/kilepipisotup.pdfIn PDF document text
    • https://burgaseguros.com/userfiles/file/49060161591.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=rational+and+irrational+square+roots+worksheet+answersPDF 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_off0000f0a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000108b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B2 19708 bytes
SHA-256: 74bf244bd5bbdbbc6754228ecd75c70143a573c31ad833f1a211f9496c57621a
font_02_sfnt_off00013c56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C56 10816 bytes
SHA-256: 835a3210b01a85d55734bee33a0ef4ece298add35e139018817a738ffa5a063f

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