Malicious PDF — malware analysis report

Static analysis result for SHA-256 c58853a005dca2b9…

MALICIOUS

PDF

102.6 KB Created: 2021-07-18 20:03:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 3560485e40b19d9eceaeefc8e4e28077 SHA-1: ac4465973c082b005b37b35299a505db08eb6fb2 SHA-256: c58853a005dca2b92918bdd37666fd7e20c1106f425a8817e7bb2f67631f290b
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, directing users to multiple compromised WordPress sites and other disposable hosting domains. The primary purpose appears to be to lure users to malicious content hosted on these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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://wendi101.com/userfiles/file/76311766861.pdf In PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/tq0eglvtu7t21ison6ngr6akoo/32090363237.pdfIn PDF document text
    • http://historia-bfured.hu/userfiles/file/losavugazefotufaz.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/37869243733.pdfIn PDF document text
    • http://yamamatoen-wanwan.jp/ckfinder/userfiles/files/gemevezovi.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/zipoxak.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210507023609.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/16086a15073737---palavawupima.pdfIn PDF document text
    • http://conflictfreeelectronics.com/ourprojects/chowki/UserFiles/renuka/file/53238884308.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/0u7ads7b9jkjo68gn4ltqir6d0/vivuvudir.pdfIn PDF document text
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607591edd5c67---zojevodinepurizufagi.pdfIn PDF document text
    • http://alternatifmedikal.com/img/userfiles/files/gekikaxelawu.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a510712c41f---madikilijotifewemuzima.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/tebuwonazunaxi.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/memarizijobun.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0100e46f6affeff61f460737845e0605/golojidabezumukutetakome.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e607038849---54189425760.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/26hs6qf78d34u2q7bsdv6re7i0/fizapejazivesav.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1a869d1e6---78615407275.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/b980ff4ea0491f2888641f95b58a8057/9868028338.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/dkn9oitaafeqpphkqjmosvo59v/24250909946.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160995fad4f409---28577235174.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609c8a9b7116c---37691621705.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=indian+independence+act+99+yearsPDF 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_off00012876.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12876 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001408d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1408D 10572 bytes
SHA-256: ab270727845660dde7f997d06b8d7e540eeeb55cead1162bc6699abebcdb4caa
font_02_sfnt_off000158c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158C6 19024 bytes
SHA-256: 5b9b5d49b62e78b099b44312ee5c39b2d28ed1c71a83e1ff5ab7b8da86e00a44

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