Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b41a0a3c97faf69…

MALICIOUS

PDF

93.7 KB Created: 2021-07-14 03:55:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c9a41d8d798e2ab52b3d6f7cef1d86b8 SHA-1: 45dc8dcbeb3e40fa1ab7c316810ab082457ec34d SHA-256: 1b41a0a3c97faf6940f5bd719f47b1f00239d80b8f804b949f9ec3ee7586c866
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised websites, suggesting an attempt to lure users to malicious or phishing content. The presence of external URIs and link farms on compromised CMS uploads indicates a phishing or redirection attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/emidq4ugbfr4ctn1or63c7bua8/82112628742.pdf In PDF document text
    • https://airflow-skateboards.com/upload/file/12838718760.pdfIn PDF document text
    • http://zeminyerkaplama.com/upload/ckfinder/files/91476494249.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/15c0bcc25b665bc526462ab4c63e49eb/38016341911.pdfIn PDF document text
    • http://teerosy.com/ipp/images/uploads/files/dirodekemuwiwalitikakud.pdfIn PDF document text
    • http://charugarware.com/DEVELOPMENT/charu_garware/uploaded/userfiles/file/96210931794.pdfIn PDF document text
    • http://childhood-matters.com/clients/49507/File/dinosawomeroxaj.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/2dd4323987099eb3bb20381c3f336a02/28373641947.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210618191832.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/d4ce1abc21eccae52818f72cd7c397ff/jivabe.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160c568316e666---navole.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/529a008ca9c000eb12415cb16042b10c/fikunavopixivejepe.pdfIn PDF document text
    • http://beepost.vn/upload/userfiles/files/xinov.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/74362025452.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/m7g10d15g32nd3bj6cu1kakcp5/katosedogipovave.pdfIn PDF document text
    • http://slp72.com/clients/7/7b/7b902bee17765b19ebdde6030f24742d/File/pifoximis.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160d08fa1e03d9---48461741867.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/ujvje8t8jnbqm496fldhfv83r5/pefojelagasozu.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098bf52b11b6---6366417228.pdfIn PDF document text
    • https://www.domosystem.gr/ckfinder/userfiles/files/polurewikefatorezalo.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/1c04f9a624aec9deaafca873531084aa/xosovul.pdfIn PDF document text
    • http://multi-accueil.fr/ressource/site-image/files/48227711251.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/de22f746f4020650f14b47dc97ceaa58/28602445264.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=sophomore+english+classPDF 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_off00010966.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10966 17728 bytes
SHA-256: 569c8d22cbc2161bf5a5dcc0bc35611a88753018fdb2512d5b8325d844642bcf
font_01_sfnt_off00013758.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13758 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014f6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F6F 10800 bytes
SHA-256: 41134beb84100c7805d8f9f3896c45cd32dd939a9a36ecd4d0ae56b40da166f7