Malicious PDF — malware analysis report

Static analysis result for SHA-256 1efa20485dc92e45…

MALICIOUS

PDF

74.8 KB Created: 2021-09-06 02:08:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cf1418b2e340dee670bd3da2ed3ee414 SHA-1: e8b28bf08dc6ea8ec2f1131e5ecf33b18c6fa27f SHA-256: 1efa20485dc92e45eae7f0efa7cd2ceaa92c92b31f1913c00ed302c3e69a9284
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. It contains numerous embedded URLs that point to external websites, many of which appear to be part of link farms or hosted on compromised CMS uploads. The presence of these links suggests the PDF is intended to redirect users to malicious sites, likely for phishing or to download further malware.

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 https://crysiq.ru/uplcv?utm_term=borderline+personality+disorder+demystified+pdf PDF link annotation
    • https://grupahatak.pl/admin/_fck_files/file/59614599903.pdfIn PDF document text
    • http://hungbuloon.com/media/ftp/file/mikufazisudurosojawuz.pdfIn PDF document text
    • http://franceplus.fr/userfiles/file/wumuzeveme.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/zaduxanetuloxed.pdfIn PDF document text
    • https://sofupingame.net/calisma2/files/uploads/gozumojoredowutakupole.pdfIn PDF document text
    • https://digireg.nz/upload/polowuleditiwafiberute.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/83559627810.pdfIn PDF document text
    • http://asirakademi.com/resimler/files/wotesukiwabilinotepoxoxek.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/28451544449.pdfIn PDF document text
    • https://xn--mgbaf4adbs1bd2i.net/upload/ckfinder/files/gavajurowekananelevize.pdfIn PDF document text
    • https://idea-web.ro/app/webroot/files/userfiles/files/xidubefuvadamivewarem.pdfIn PDF document text
    • https://ymy-tea.tw/upload/files/90855115942.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/54j294ukmvfdsdao6alutea9e2/96991856996.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/04d4dfcf8ee7cb95c8b6f54b4e2f709d/dujojexipiwobiw.pdfIn PDF document text
    • https://www.acetechnology.co.in/wp-content/plugins/super-forms/uploads/php/files/jkquh8phnfjba5rjrb7s0fqpot/59855077440.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/c64c412518710d8c8cc91658f3303b11/lavirafuzuzidajidaviduzib.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5649f2acde---memiwurisoja.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/zugipegidupura.pdfIn PDF document text
    • http://lnyuanzong.com/uploads/files/20210802062429.pdfIn PDF document text
    • http://fittbike.hu/files/file/13050682871.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608a63eb42a56---sexug.pdfIn PDF document text
    • http://artospace.com/pics/file/34581092070.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160a1da11e94f9---56405822489.pdfIn PDF document text
    • https://unicornccc.com/ckfinder/userfiles/files/ruluzozijezib.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/zezedosinudubavalazediz.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_off0000c0ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d911.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD911 16796 bytes
SHA-256: e52555722394e667e3cad5da9cc0aaf9e49317132b46fba079d7726525dc5c25
font_02_sfnt_off000104a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A4 10824 bytes
SHA-256: 453598aea583d936cc23fa0a27ccac0caef7fa68dd38a77a3b34f2340cbbedd3

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