Malicious PDF — malware analysis report

Static analysis result for SHA-256 a65f8c9cd454c455…

MALICIOUS

PDF

72.2 KB Created: 2021-09-05 04:22:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a3e2effbfb1eb82419606a064a5a75e9 SHA-1: f1b9aeeba5a9235eab522149e1a2c3f69d8e174e SHA-256: a65f8c9cd454c4555442b4a429bcf786a8e1896d1826ea697d2a6b8f0f6bd15f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. One such URL is https://philabc.ru/uplcv?utm_term=lasko+tower+fan+4820+manual, which appears to be a lure. The presence of embedded JavaScript, though not explicitly detailed, is common in malicious PDFs for redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://philabc.ru/uplcv?utm_term=lasko+tower+fan+4820+manual PDF link annotation
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8a29660acd9d6f82e47d76150936d462/8923571961.pdfIn PDF document text
    • http://maskaevlawyer.ru/userfiles/file/gataruje.pdfIn PDF document text
    • http://savaksangida.com/resimler/files/17906695987.pdfIn PDF document text
    • http://shiokuda1.com/contents//files/80431984479.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160830b685255b---53524281140.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/pukavusinig.pdfIn PDF document text
    • http://fructusartis.com/i/File/suwata.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/6a09b36263f12d31cbde1ae22c07617b/19740769663.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16098e8f04bbfe---fomixatobexu.pdfIn PDF document text
    • http://www.cavice.fi/tiedostot/files/bosokuxeguzidijekilu.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/302f4962db24c74acfee370c86c2fbe3/23077649957.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/t77ri96ch2icaqvc8pln67odk2/xubavijubibelunolinu.pdfIn PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/36897959030.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/jo9bggpr1nqrcr3af16sj8nd03/94853460402.pdfIn PDF document text
    • http://youzedu.com/ckimages/files/20210815162441219586.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/d6qnii4bg3lef0jks2oimo8e29/papavujumafojiwazuviginu.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/10031f31f8d3b686f2ca0215335e3704/libodamirafirul.pdfIn PDF document text
    • http://gyobel.itpublic/file/lofoxujoxigojevegone.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/nj3nth9djsl51bkuslsb3qjee4/79090949999.pdfIn PDF document text
    • https://e-casainteligenta.ro/userfiles/file/muwuduvuxebunodunatovixif.pdfIn PDF document text
    • https://egyptsuntours.com/userfiles/files/45290962031.pdfIn PDF document text
    • http://topup-fight.com/ckfinder/userfiles/files/58619564800.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_off0000b91b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB91B 15708 bytes
SHA-256: c0e4b2fd6fcfa8350f72eba489347d49ef39db087f15a895b79cfd3e8c58aa83
font_01_sfnt_off0000e141.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE141 11048 bytes
SHA-256: 3c7e0547c617305191ccac9a949a39ebd941c3d0ea861bff3d81fc198bf6b8c6
font_02_sfnt_off0000fb31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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