Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2f35cda7b0ef4ac…

MALICIOUS

PDF

80.5 KB Created: 2021-09-23 07:47:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 31656f7a212f118d5a73fa2b5b5d41a9 SHA-1: 462e7b89dfa625be88be3311db744a519d44ddce SHA-256: a2f35cda7b0ef4ac6ce51c02c9ff104545a0b1e78ff1ca71d5e6ef2077ee6cc5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farms pointing to potentially malicious websites, including those hosted on compromised CMS platforms and disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the nature of the links and the heuristic firings suggest the PDF is designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • 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.
  • 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://pixomot.ru/uplcv?utm_term=upin+ipin+kst+chapter+1 PDF link annotation
    • http://sarljarry.fr/userfiles/file/nazasurusit.pdfIn PDF document text
    • https://wilocom.ro/ckfinder/userfiles/files/27247240339.pdfIn PDF document text
    • https://ht-cooling-j3t.com/contents/files/xamerigepijukovudiz.pdfIn PDF document text
    • http://flathead.herosuite.com/userfiles/file/43622182668.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/lijozi.pdfIn PDF document text
    • http://erex.hu/upload/file/gaketofezurunazupadego.pdfIn PDF document text
    • http://termosystem.pl/userfiles/file/dexixirapomabiguxodus.pdfIn PDF document text
    • http://cappellastudio.it/userfiles/files/vafexajifu.pdfIn PDF document text
    • http://geoscan.it/userfiles/files/31683676841.pdfIn PDF document text
    • http://kriosispl.com/cote_dor_import/admin/ckfinder/userfiles/files/wetedemozededijer.pdfIn PDF document text
    • http://fusiongrup.ro/userfiles/file/73548220936.pdfIn PDF document text
    • http://tv-kitchen.ru/files/files/ledivir.pdfIn PDF document text
    • http://networkinglikepro.com/ckfinder/userfiles/files/mukaza.pdfIn PDF document text
    • http://ozdermusavirlik.net/userfiles/file/87055566250.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3cc959c96---72343658103.pdfIn PDF document text
    • http://xn----gtbercbfedtm3b.xn--p1ai/admin/ckfinder/userfiles/files/zinekerelerom.pdfIn PDF document text
    • http://crabandclaw.com/uploads/files/2513035902.pdfIn PDF document text
    • https://abrasco.org.br/ckfinder/userfiles/files/xivabinufa.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131f722ac3d6---foxibupegemoxuzoxuganox.pdfIn PDF document text
    • http://live-lessons.net/lcj/web/uploads/assets/file/81471307589.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/mudigodazevegidifomo.pdfIn PDF document text
    • https://relans-nn.ru/images/docs/file/maziroxabixuporijalel.pdfIn PDF document text
    • https://tepatsasaran.com/contents/files/64651605342.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/e97f96570e9636ee31dd01c2fd8795e2/54310192999.pdfIn PDF document text
    • http://moto-bike.pl/userfiles/file/8725947727.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_off0000d724.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD724 17620 bytes
SHA-256: 32dc2964667edb296253971bf11aa91604f72750c8bf348307ef5dcd90821c05
font_01_sfnt_off0001050d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1050D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D24 10456 bytes
SHA-256: 5e7e38994a9edb13d6acac173a0f0bbe2e951fbe8f71a3e4ece49fad5736ea27

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