Malicious PDF — malware analysis report

Static analysis result for SHA-256 c078873aa5b40a6e…

MALICIOUS

PDF

82.6 KB Created: 2021-10-15 03:03:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f4ff7f7dc0f64b6750e4f5f0d6c2179c SHA-1: d79289bb3d38cd54c735c76b5e11e928dc2b5474 SHA-256: c078873aa5b40a6e1b0bacb3104bb538fe91c08c0574b4be0b6c127f15698cba
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The file's structure as a link farm, with multiple links to potentially malicious content, supports the classification as a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://www.farnostbobrova.cz/ckfinder/files/55574979604.pdf In PDF document text
    • https://unique-u.biz/images/uploads/file/ranajoka.pdfIn PDF document text
    • https://www.la-melodie-des-saveurs.fr/ckfinder/userfiles/files/7678664106.pdfIn PDF document text
    • http://alexdisinfestazioni.com/userfiles/files/lazupoxuzalurilukevojewo.pdfIn PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/fasofenizugi.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/urdol1n163p0mvolvqb41b7kh0/lafoxutevokur.pdfIn PDF document text
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/poludegiwal.pdfIn PDF document text
    • http://sibzakon.ru/ckfinder/userfiles/files/48203310052.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/161321942131a5---saduru.pdfIn PDF document text
    • https://limsurempat.com/contents/files/87629532775.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/40317326239.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f886aba818---23202555180.pdfIn PDF document text
    • http://thangmayedex.com/webroot/img/files/renoloziliri.pdfIn PDF document text
    • https://rubyyadav.com/nbloom/fckuploads/file/17704980668.pdfIn PDF document text
    • http://140.121.125.49/ckfinder/userfiles/files/20210911_110104.pdfPDF link annotation
    • https://edenestates.com/ckfinder/userfiles/files/xilopowelizafenis.pdfIn PDF document text
    • http://ap116.ru/userfiles/file/51040032468.pdfIn PDF document text
    • http://sksound.com/userfiles/file/59879276243.pdfIn PDF document text
    • http://abwingsde.com/uploads/files/70206812073.pdfIn PDF document text
    • https://j-kowalewski.pl/uploads/userfiles/files/72818377427.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/addf1cf612a7e7766d475e66364b9fe9/jagemevanulosowatajupabaw.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/HKUGBsJGI0E/uplcv?utm_term=100+approval+payday+loansPDF link annotation
    • http://zs.tom.ru/jsplugins/ckfinder/userfiles/files/kifovefulovokugir.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_off0000dffb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFFB 17388 bytes
SHA-256: 4e705726093176911a29cebcb0bbedbf5f66f039fffec8b41e653c374e436cfb
font_01_sfnt_off00010d2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012544.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12544 10320 bytes
SHA-256: ae645ce94938ff5b6cb08f3832849be97d0c3a99a9da75ad675cf4a56ca21eab

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