Malicious PDF — malware analysis report

Static analysis result for SHA-256 3266e6c3f710772e…

MALICIOUS

PDF

74.1 KB Created: 2021-09-16 08:36:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0c5318b439642e652332c17722190ca7 SHA-1: 385bc0e0ead824cea91617962b0990e03f17cc42 SHA-256: 3266e6c3f710772e68130868ab07c38637064a5c39b665f9452b9ac056851789
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Static analysis reveals it functions as a link farm, with numerous URLs pointing to compromised WordPress sites and other disposable hosting. These links likely lead to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://egca.fr/userfiles/file/samezoserosag.pdf In PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135ab5db5f82---dalogarufujogaza.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161414d8952771---dusupikakixitomapuduxivat.pdfIn PDF document text
    • http://nena-artspace.com/ckfinder/userfiles/files/rogumid.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/2a346713120c1e2eeb6fb33edfbc18da/zolubopas.pdfIn PDF document text
    • http://seanbittinger.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/45089673198.pdfIn PDF document text
    • https://valubil.com/public/uploads/cms_file/cms_files/sanukagewonejevoja.pdfIn PDF document text
    • http://vividconcept.in/userfiles/file/katuvelezis.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/08e28f5db3bd33ef02a6de41fca521ab/pisodararirosibo.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.fr/userfiles/file/13424741001.pdfIn PDF document text
    • http://wcsps.com.tw/ckfinder/userfiles/files/13970803798.pdfIn PDF document text
    • https://itchanoi.vn/uploads/news_file/pakamajiroxif.pdfIn PDF document text
    • http://linkingpeople.info/userfiles/file/sonafudofobasemefoguf.pdfIn PDF document text
    • https://connatlas.com/home/conn/public_html/ckfinder/userfiles/files/dafilusesagefibawijirowux.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16130da2657518---sikanovitu.pdfIn PDF document text
    • http://podwierzba.eu/ckfinder/userfiles/files/sokoto.pdfIn PDF document text
    • http://tnshoppingbag.com/upfiles/file/jijowuxofuma.pdfIn PDF document text
    • http://kondicionery-dzerzhinskij.ru/upload_picture/file/99531334023.pdfIn PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/89382242993.pdfIn PDF document text
    • http://local-minicab.com/survey/userfiles/files/povikapepepikitategej.pdfIn PDF document text
    • https://topconta.ro/userfiles/file/jubowowebepikerusud.pdfIn PDF document text
    • http://xn--b1agjlwjc3g.xn--p1ai/ckfinder/userfiles/files/41823725451.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=android+viewpager+indicator+dotsPDF 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_off0000bcc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCC4 17164 bytes
SHA-256: 72974707f31a90620eb9768eee0da66d00f670e85e4b6e1756a96e03549d350f
font_01_sfnt_off0000e9b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B4 10776 bytes
SHA-256: 6765831172ca4daa606753fa74773bfeb9b9ee51812dd5e7a98ac85d8720bd57
font_02_sfnt_off00010289.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10289 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1