Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ea3687c6435067f…

MALICIOUS

PDF

78.8 KB Created: 2021-09-08 06:08:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9f77dccb5b6a2921394f1ed0e9b4b097 SHA-1: cd5efc503de7d82118978578dae613630dd6bb9f SHA-256: 3ea3687c6435067f80902bdc13e3acc0fad651723d27878204fb454009c2ce46
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with many pointing to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. No scripts were extracted, but the structure and URLs suggest a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://crewmak.ru/uplcv?utm_term=normas+apa+y+mla+pdf PDF link annotation
    • http://bertrandetgastineaudesigners.fr/userfiles/file/63097909183.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160750a28f2f58---33536540353.pdfIn PDF document text
    • https://hamasataccessories.com/userfiles/files/2944453216.pdfIn PDF document text
    • https://cytairtool.com/test/userfiles/file/20210709_9ca52.pdfIn PDF document text
    • http://homenet-spb.ru/userfiles/file/newitefewitusonosedu.pdfIn PDF document text
    • https://mudrun.com/home/mud/public_html/ckfinder/userfiles/files/33437832180.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/mugonazed.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/6155920015.pdfIn PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/58683792609.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16114a462ccef6---31094910286.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/f1a29c748620050d67d9ac42615f4017/tivufokezidoraxufum.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/pedilidu.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/38986063303.pdfIn PDF document text
    • http://rogersdesignhouse.com/uploads/files/lubosuja.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/56a83ff0c5219da360bbe6737c6d6412/tolabitedikowir.pdfIn PDF document text
    • http://icloudcleaners.com/uploads/account/autoresponderfiles/77083521316.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f22d759cac---51311459940.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/10176927035.pdfIn PDF document text
    • http://womensmentalhealthmd.com/clients/9/9a/9a9ccad1be43d50cbc9928f06550b956/File/10563340098.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-8-2/20210802195454919386.pdfIn PDF document text
    • http://keifo.ru/ckfinder/userfiles/files/65206646505.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16070230e580ac---sonifow.pdfIn PDF document text
    • http://pluimveebeurs.com/userfiles/file/76492928252.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/vuzekuduneji.pdfIn PDF document text
    • http://carbonelite.ru/file/potafazig.pdfIn PDF document text
    • https://monuments-msk.ru/wp-content/plugins/super-forms/uploads/php/files/a386686768e710d2d09aadcf4131b709/59596545520.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d089.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD089 10324 bytes
SHA-256: 883a9515f14bd4553f042ab49bb523281dec717e6944a97725accc81a4ba23cd
font_01_sfnt_off0000e7dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ffee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFEE 17176 bytes
SHA-256: 15e761d06a2fee76ccf442957bee909efdaa434d14ee3a3642d589e42896d7a6

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