Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e7c7de29d2a9e06…

MALICIOUS

PDF

79.9 KB Created: 2021-08-16 12:25:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: edcb4cb1e460ccb2778453148ec82f73 SHA-1: 28ac02a38112d37cd833d19d764ebfae1c996d91 SHA-256: 4e7c7de29d2a9e06206588ecb08f47b1717647f9f1a347590ddaf13f8111b667
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to websites hosted on compromised WordPress installations, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan. The document body is heavily obfuscated and does not provide direct user-facing content, but the presence of link farms and compromised hosting is indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://e-kva.ru/admin/ckfinder/userfiles/files/82909435484.pdf In PDF document text
    • https://gmt-tw.com/app/webroot/userfiles/files/vejomebutijirabozazexe.pdfIn PDF document text
    • https://locktactyuma.com/userfiles/file/xoxetaxidirile.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/ba6fd6a1e64641afc6ab74e35e228096/48289945460.pdfIn PDF document text
    • https://cbconsulting112.ca/userfiles/files/toziwem.pdfIn PDF document text
    • http://lagunarent.lt/ckfinder/userfiles/files/jelonokagujigofuxadefa.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094ab29dad81---dilukabedavubani.pdfIn PDF document text
    • http://hotelstrack.com/bot/ckfinder/uf/files/basizogugefoxozomelod.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/fdc3ceb1b65c47596598459332e1a218/voladagawusedusuwowov.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b8e8a4b47d---vunuluzerefibagovonisebo.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a011ba6825e---6361223376.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160865fbff3b9d---kolufa.pdfIn PDF document text
    • https://haysalon.com/public_html/userfiles/file/vubemetitiboliwivolubojol.pdfIn PDF document text
    • http://inphuduong.vn/upload/files/buzapovividebit.pdfIn PDF document text
    • https://kuraniterbiye.com/resimler/files/56016527754.pdfIn PDF document text
    • https://cevhertemizlik.com/userfiles/files/38645165172.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/97723301422.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/f12f0e3e48d42fb26c89e5b9205d5745/9949260202.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a04b4ed443c---10221520048.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/13691598460.pdfIn PDF document text
    • http://chickenwild.com/upload/contents/images/images/tilusanomanev.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/16089982fbf748---xudab.pdfIn PDF document text
    • http://nfraccon.org/userfiles/file/51163641833.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=powerful+prayer+to+break+generational+cursesPDF 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_off0000d551.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD551 16316 bytes
SHA-256: 939c4329127297cb15770e4b380d038b2edd0dfa577055bee26bc4610f1b3c5e
font_01_sfnt_off0000ffb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB3 11188 bytes
SHA-256: 92b9b555833c7e609f6a53c30ad686144c111e13328c6854b3f7e372f8ec4bdb
font_02_sfnt_off000119eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1