Malicious PDF — malware analysis report

Static analysis result for SHA-256 3be9c3016e8919c9…

MALICIOUS

PDF

82.5 KB Created: 2021-09-11 16:01:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6afbc3f2ca060ee75c2288e08a8d2724 SHA-1: 3071f4d3c7573b9f7165640f11cfb05087deddfd SHA-256: 3be9c3016e8919c9ec7b96eda6915f4197bc9da23efc4704eb6542d3e7ca5ba1
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • 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://harmonie-avion.fr/actualite/files/77436930329.pdf In PDF document text
    • http://gojjang.com/uploads/files/87478403723.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613bba4e83996---fikuzojerazivazax.pdfIn PDF document text
    • http://remaining-mc.de/userfiles/file/ritubidezetuboxonusiliro.pdfIn PDF document text
    • http://sushistoryus.com/uploads/files/jidilukesixozugo.pdfIn PDF document text
    • http://orderleesushi.com/uploads/files/mixebebo.pdfIn PDF document text
    • http://chrisnoblelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/10586954715.pdfIn PDF document text
    • http://atek-ent.com/upload/file/wesemopipuwagidat.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/mabuz.pdfIn PDF document text
    • http://philipwillettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/80554176772.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/9ioihmgg9vm4k8rulkf60v0p8l/9916304466.pdfIn PDF document text
    • http://bkmarine.net/ckfinder/userfiles/files/1630540697.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/9ae201cf0bd915bf56007fef82f339f4/83952122046.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/161309e14a3e6f---pitaxoluxibavupatiburu.pdfIn PDF document text
    • https://expomediainc.com/upload/file/sabekodavurimawerine.pdfIn PDF document text
    • https://vietnam-pump.com/userfiles/file/72456255803.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/78129776328.pdfIn PDF document text
    • http://ppfi-online.com/userfiles/file/dativakegeradepim.pdfIn PDF document text
    • http://dungcubepgiangtrinh.com/webroot/img/files/miduvifikezesitefonaf.pdfIn PDF document text
    • http://mnwebdesign.dk/userfiles/file/vafixoxotunevelopakawiw.pdfIn PDF document text
    • https://abyway.lv/images/ck_images/files/62122759157.pdfIn PDF document text
    • http://haciogullari.com/depo/sayfaresim/file/23013957387.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/e993f56efb6f23497a0d3c8ead4a7ca4/rarawufidekuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=a+whack+on+the+side+of+the+head+pdfPDF 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_off0000df2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f746.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF746 10728 bytes
SHA-256: f8e83b672d5754cc9588a4ff3aeb144a0b6cc722b9de1c5757d299fd7af05d5d
font_02_sfnt_off00011003.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11003 17128 bytes
SHA-256: a24c3a5c2506a7fab3b6892017ffe68709d00728562d53f04820df6826df5c74