Malicious PDF — malware analysis report

Static analysis result for SHA-256 85a6fd548bd716b6…

MALICIOUS

PDF

83.3 KB Created: 2021-09-01 17:00:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 03cfb921f7621a201a8e1b03c9e4c0a8 SHA-1: 44a7a8df846ee04db6a4328f0da2ebfc63b635f7 SHA-256: 85a6fd548bd716b6c7b218ba521e6928c9422edaa83f61d2f5089f2291fd7c29
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a common tactic to distribute further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/5c2c458a6db5e040bfe1c959c3b1bf26/kiwevusepafezi.pdf In PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af87f43231e---10440182310.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/a5fcf1bcc98f2fa36c824176a587b247/nenone.pdfIn PDF document text
    • http://vandervalk.reviews/app/webroot/files/userfiles/files/90729864179.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/0c26115e24c19f01898e80956f3fd71d/wanovelimofubobu.pdfIn PDF document text
    • http://china-engine.net/ckfinder/userfiles/files/roperewovobezipog.pdfIn PDF document text
    • https://www.phuketvillarentalandservices.com/ckfinder/userfiles/files/13165529742.pdfIn PDF document text
    • https://mvpartners.be/images/uploadedimages/file/88572855578.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16081cf2c0e368---38362880858.pdfIn PDF document text
    • https://maximatrimony.com/ckfinder/userfiles/files/77508810957.pdfIn PDF document text
    • http://greenbrier101.com/userimages/99384337568.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/56a91ad48b17f71eebbd236322f829ab/18084383140.pdfIn PDF document text
    • https://artinterior.bg/userfiles/file/46592608552.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/ledafo.pdfIn PDF document text
    • http://logo4you.dk/userfiles/file/30349266230.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/taxovenavidatipe.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3f0f900f06c6d47a5a86500c159f062d/zuraben.pdfIn PDF document text
    • http://geoplan.su/userfiles/file/84800990996.pdfIn PDF document text
    • http://hzqzg.com/d/files/53548154311.pdfIn PDF document text
    • https://yssnewlessons.org/UserFilesTwo/file/72311124038.pdfIn PDF document text
    • http://eastendmediation.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/45603189501.pdfIn PDF document text
    • http://truhlarstvisollner.cz/data/file/lelifug.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaaef54d84d---72844979271.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b44a2f0523---vuzebinot.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/nugavak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=adhd+rating+scale+iv+school+version+pdfPDF 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_off0000dbd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD8 19876 bytes
SHA-256: d7e1303b2514c9f7c27a1824f9ec4e3c4cc06c2334be1b896074692d868d7c21
font_01_sfnt_off00010e29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E29 10944 bytes
SHA-256: d7aebd3861c28f5bd62ca27a396f85374007c23b00db2e3c0f31d19858b579e8
font_02_sfnt_off00012753.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12753 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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