Malicious PDF — malware analysis report

Static analysis result for SHA-256 80af5ac00b7e35c9…

MALICIOUS

PDF

75.0 KB Created: 2021-09-19 03:29:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d8bf8e9849dc4fc87bb18a84b6dc3215 SHA-1: a1116e0333e694a9f3bfd00004156afdaaaa89b1 SHA-256: 80af5ac00b7e35c985508484b8c5b168bf06768702cfdf6dc1907b0070baf8c5
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs pointing to compromised websites, suggesting it's part of a link farm designed to redirect users. The heuristic 'SE_QR_LURE' indicates the document may instruct users to scan a QR code, a common tactic in phishing campaigns. While no scripts were explicitly extracted, the nature of the embedded URLs and the overall detection strongly suggest a phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://archism.ru/uplcv?utm_term=ispy+apk+appzilla PDF link annotation
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614203f57279c---31566482136.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614034c61a1fb---85012200972.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/aaa5fb35526067f5e6e98f3410ce4ca5/23381769767.pdfIn PDF document text
    • http://solyaris.pro/admin/ckfinder/userfiles/files/87079497119.pdfIn PDF document text
    • http://tentauto23.ru/ckfinder/userfiles/files/18081364606.pdfIn PDF document text
    • http://kmsenior.org/file/files/wedimi.pdfIn PDF document text
    • http://nrgmedia.hu/files/file/23315883179.pdfIn PDF document text
    • http://finadev-groupe.com/userfiles/file/lifurewunomabun.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///55900443231.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/fosupov.pdfIn PDF document text
    • http://hidropro.hu/upload/rumifes.pdfIn PDF document text
    • http://voszveszprem.hu/_user/file/letutomeniwujenorusi.pdfIn PDF document text
    • http://scpt.it/userfiles/files/wuwijiwu.pdfIn PDF document text
    • http://staceyasp.com/UserFiles/file/7345727145.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/reluwimimuta.pdfIn PDF document text
    • https://conrays.ru/f/data/kamilo.pdfIn PDF document text
    • https://wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/93078612380.pdfIn PDF document text
    • http://chinajnbt.com/images/upload/File/sulogunudutonivafokod.pdfIn PDF document text
    • http://xn----8sbfhu6ab4bqv.xn--p1ai/userfiles/file/51808263190.pdfIn PDF document text
    • http://wxbeimei.cn/upload/ckimg/files/202109141518199100.pdfIn PDF document text
    • https://mimpidia.com/contents/files/60465193056.pdfIn PDF document text
    • http://geofer.eu/userfiles/files/57868884279.pdfIn PDF document text
    • http://a1climbing.com/userfiles/files/baluxizix.pdfIn PDF document text
    • http://abwrosedale.com/uploads/files/rabin.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_off0000c648.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC648 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE5E 9908 bytes
SHA-256: 373115ce5db6ff4ca455000fa1c4e07e68332cf1d8a6229d734480941791f149
font_02_sfnt_off0000f453.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF453 16280 bytes
SHA-256: de2e815032e6735dedab90d3a8995f188ec7ec4422bc558b521febf78582b237

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