Malicious PDF — malware analysis report

Static analysis result for SHA-256 436d6621e6778d30…

MALICIOUS

PDF

77.8 KB Created: 2021-09-15 20:12:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 752ae026c39114dedfd02ae0a2dd1da6 SHA-1: bd30c34c0814f5dbed06285c64ec435b5b33af16 SHA-256: 436d6621e6778d30ec32fbafc88dd10e1988dfcf10cc45e54feea4cb9d6a4f7b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics as a link farm, with many URLs pointing to potentially compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of numerous links, including one pointing to a compromised WordPress upload, supports the attack pattern of luring users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://sarljarry.com/userfiles/file/filivava.pdf In PDF document text
    • http://dep14kirov.ru/userfiles/file/62625147114.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c760db7722---fujade.pdfIn PDF document text
    • http://www.jasolasia.com/image/upload/File/febusuwu.pdfIn PDF document text
    • http://marienoellebermond.com/img/uploaded/file/14880830978.pdfIn PDF document text
    • https://xn--psg-9lac.hu/files/files/79557891664.pdfIn PDF document text
    • http://buyyoutubecomments.com/ci/userfiles/files/lavibikolupowulu.pdfIn PDF document text
    • https://campermagazine.tv/public/file/gevotekemikarasupo.pdfIn PDF document text
    • http://hidramaco.com/files/files/nodesemidumuritajavode.pdfIn PDF document text
    • http://studiomilano.eu/userfiles/files/wuwatebupamifatebuxeron.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133ba23c89db---41485396776.pdfIn PDF document text
    • http://athaj2.specialty-match.com/upload/files/pokaremesitapujozorob.pdfIn PDF document text
    • http://unleadedcoffee.cz/soubory/gajikujonopewage.pdfIn PDF document text
    • http://kbidc.kr/upload/editor/file/1631008686.pdfIn PDF document text
    • http://englandmatchshirts.com/assets/file/95314034784.pdfIn PDF document text
    • https://intrigantka.ru/images/userfiles/file/73052492044.pdfIn PDF document text
    • http://bapassamarinda.id/assets/ckfinder/core/connector/php/uploads/files/bomomazetomipize.pdfIn PDF document text
    • https://fond.ru/userfiles/file/morijulagujusizudek.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e06798690a---lomakapodebabivarapibe.pdfIn PDF document text
    • https://marblobaths.ph/app/webroot/img/files/jinomik.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dbd808a0f2---wozilimotuxupijofewure.pdfIn PDF document text
    • https://ajansnigde.com/resimler/files/48920247605.pdfIn PDF document text
    • https://sandipkumardutta.com/ckfinder/userfiles/files/5115395271.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/81750525407.pdfIn PDF document text
    • https://euroroma-bg.org/files/file/83162291622.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=lego+city+apk+modPDF link annotation
    • 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_off0000ca46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA46 18084 bytes
SHA-256: 5dc7d10a7ba1230d013f9b06a8614b4678feeb0224578714991425e78b95a4ea
font_01_sfnt_off0000f960.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF960 10600 bytes
SHA-256: ec5488af88a8e56544df098ecdf180a564a69855093c622f13b2d518ac5010c1
font_02_sfnt_off00011177.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11177 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1