Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad4a9724b077afb8…

MALICIOUS

PDF

115.8 KB Created: 2021-09-06 18:17:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d7600a8ceb4898dd8f9a800a08102a3a SHA-1: b5ec65482ee4654a476bddc2d183b3bf7863b95b SHA-256: ad4a9724b077afb875634b35c7c5301d427d0918fbdd0df93d6b15a6879d5a72
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage, indicating a link farm designed to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a malicious document, potentially used as a lure in a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081d59db4a0b---mezugowavar.pdf In PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/e96e6cb8fbc703d72dc6f51d9c36009d/70331853512.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2tbt4hencg4jmrdflmgdc9gbs5/dabuko.pdfIn PDF document text
    • http://eurogeographyjournal.eu/admin/fckfiles/file/fitukinalufitozit.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c9a692bd4f1---86079434696.pdfIn PDF document text
    • http://winfielddeli.com/ckfinder/userfiles/files/22184678114.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/11gq0t4k6l73kihucajvgseqp4/97882553068.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/n7g57b9rf9puopa8he5o4b8240/fasiloku.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0b315b98c---zamirasagomexilemenegariw.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/mijifibatizoxiko.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b09ad701942.pdfIn PDF document text
    • https://tradingphrases.com/userfiles/files/demavulebapebive.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/cb14ebb06a1e6fc39197c935231fa603/gamapezafoxi.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160721e7b429b5---28803095356.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/mixugaxotuwedali.pdfIn PDF document text
    • https://aletihad-group.com/userfiles/files/rejulasa.pdfIn PDF document text
    • http://aliguoriarchitetto.eu/userfiles/files/84105208327.pdfIn PDF document text
    • https://ebdaatcoop.com/userfiles/files/pimupobematuzawerox.pdfIn PDF document text
    • http://rentaruedas.com/files/others/90034992369.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/dv2u5t17tk3uko1giefrp4ba88/87219109472.pdfIn PDF document text
    • http://kooijobs.in/ckfinder/userfiles/files/13523082384.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-6/file/fuxarojota.pdfIn PDF document text
    • http://dancedynamicsla.com/clients/38740/File/wolefegarena.pdfIn PDF document text
    • https://wagaskar.com/media/larexulirajaj.pdfIn PDF document text
    • https://liepasmuiza.lv/userfiles/library/58579900493.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=chuang+tzu+pdf+englishPDF 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_off0001522a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1522A 24624 bytes
SHA-256: f7f1ea908ecc851840560056175252c7c561a5122580d53c451edb91fcd4ba91
font_01_sfnt_off00019116.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19116 10748 bytes
SHA-256: 423c2f7de1f3327cb689e32ee3014e93067c7e269f166768759638f1f53cbb2a
font_02_sfnt_off0001a996.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A996 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1