Malicious PDF — malware analysis report

Static analysis result for SHA-256 5eafa9dfc8eff2d9…

MALICIOUS

PDF

81.1 KB Created: 2021-08-29 05:43:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: bd24fe8a4f719facd9b9deb25edaa6c0 SHA-1: 373898ec2c2dba149fd0095caf832de5e079c09b SHA-256: 5eafa9dfc8eff2d938f17303157d41b375e047816ab86f219d3a2fcff92b70f6
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://krisoc.ru/uplcv?utm_term=au+in+french PDF link annotation
    • http://studiopol.it/userfiles/files/26811360304.pdfIn PDF document text
    • http://coyada.com/up_images/up_images/levizavoredi.pdfIn PDF document text
    • http://xn----gtbercbfedtm3b.xn--p1ai/admin/ckfinder/userfiles/files/wofile.pdfIn PDF document text
    • http://bezpiecznamlodosc.org/files/file/wedunuxez.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/menirimejupukiboduzok.pdfIn PDF document text
    • http://kielcenoca.pl/files/file/1452903640.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/81743000983.pdfIn PDF document text
    • http://twothirdsmajority.us/clients/38522/File/tuniwarudu.pdfIn PDF document text
    • http://pinzimoniofiumicino.eu/userfiles/files/luwetizixuxumepajo.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/8rd7t697s6ib3bvv3530rrsjkj/36303319285.pdfIn PDF document text
    • http://mid-europe-ex.com/11265771723.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/43bd205f4b0b38aed7814f0acaef2617/28888921396.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a23d7a9b54d---zofidusugawabavorav.pdfIn PDF document text
    • http://eko-uklid.com/files/file/soxiwebukujopizidini.pdfIn PDF document text
    • https://salubrismd.com/wp-content/plugins/super-forms/uploads/php/files/678170f5b16e4a73b6b251180a4b656a/kenol.pdfIn PDF document text
    • https://motiwalainstitutes.org/userfiles/file/gabuwimemerokoziriforixi.pdfIn PDF document text
    • http://kaptenhoki.com/contents//files/fesiretimurezurenafukesex.pdfIn PDF document text
    • https://cordovajewelry.com/images/file/gonidejisulavobu.pdfIn PDF document text
    • http://www.amanuttarakhand.org/ckfinder/userfiles/files/lawodekarovasoruvo.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c975cfdbc40---ralutajoxedesarilizodagij.pdfIn PDF document text
    • http://alfavs.eu/userfiles/file/jepep.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b60cd7005---98738893516.pdfIn PDF document text
    • http://ferrogep99.hu/static/media/file/70358031267.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_off0000d49f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD49F 20236 bytes
SHA-256: 8ddcee9027c61aef3ab0acc4aef203a4ef9fbbaea40f61b6b5286e8fd65312ea
font_01_sfnt_off00010871.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10871 9920 bytes
SHA-256: 873856e0ec4309355f584d07478d384f6e39d2c786c44f5d6abc2fece40f3665
font_02_sfnt_off00011e36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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