Malicious PDF — malware analysis report

Static analysis result for SHA-256 042092281a2a3b4c…

MALICIOUS

PDF

84.7 KB Created: 2021-07-22 08:12:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: de32320862b6159b42d3dce9283ce7d1 SHA-1: 8475ea9164e338e15f1c358b8e3c4d2282b58c81 SHA-256: 042092281a2a3b4c61bfb3ea29323d89e1bc22d2dfc42e258cad206b0471c1ec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malware or phishing content. The presence of a link with 'utm_term=download+free+gta+san+andreas+highly+compressed+for+pc' indicates a lure for potentially unwanted software. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://pillshop.ru/uimg/files/nutobitilaxegenojidipetif.pdf In PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2754851364---61372586950.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b796c2b778---vetibaxenamosel.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/f294ec68962adc1f63bf4f9c4d1c47d4/49481442201.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/45b47697b3aa8fdb9de1bed63308ed8d/fojufizogesesebebe.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3673edc78---japelirozazewogupetu.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16091ac8d4f031---54256823773.pdfIn PDF document text
    • http://btfa.tw/upload/files/30431617002.pdfIn PDF document text
    • http://aygroupmuh.com/image/files/83862774963.pdfIn PDF document text
    • http://daydreamspin.com/userfiles/file/jinesukikiluxaruzuka.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/74f7523bb55f4f24ebb96e3cadd75881/93446296237.pdfIn PDF document text
    • https://eminenceconstruction.ca/viking1/uploads/files/bulomutuxux.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/kitelosowuzepoxoxipazen.pdfIn PDF document text
    • https://podereilmontaleo.it/writable/public/userfiles/file/xogepasigokaxixawipi.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/larazafusifegojijokobuwiz.pdfIn PDF document text
    • http://xn--80aaa1acmiejxr6d7fg.xn--p1ai/data/files/benazubonuvapazitab.pdfIn PDF document text
    • https://buka.ru/sadm_files/kedunipajujejoxebilumere.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16083733f7bce7---17440360236.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/43c99c16396ebfa4d1046b776f13e579/xavokorererukurotimop.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/g4re2lpkussvflj3es2ba68rq5/36429914116.pdfIn PDF document text
    • https://cncostruzioni.com/userfiles/file/piwobuliwib.pdfIn PDF document text
    • http://freetourscadiz.com//ckfinder/userfiles/files/13407184428.pdfIn PDF document text
    • http://giovanniseneca.eu/userfiles/files/kepaxosotasenegif.pdfIn PDF document text
    • http://divodizain.ru/ckfinder/userfiles/files/jemelelasix.pdfIn PDF document text
    • https://wulf-sanitaer.de/wp-content/plugins/super-forms/uploads/php/files/uqo70cugkr030qml8u3irf6vsc/98379510435.pdfIn PDF document text
    • http://cherishedmomentphotos.com/clients/8/84/84fe84b553acfcd191e166b7401b6f02/File/lobipidaxurenonajikix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=download+free+gta+san+andreas+highly+compressed+for+pcPDF 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_off0000e564.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE564 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD7B 11268 bytes
SHA-256: 24a1f64a0e777a46fe91c333db05e26d87249f6e54eb5239567a971a15bd1aab
font_02_sfnt_off00011797.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11797 17168 bytes
SHA-256: d7282836ab203e82b3ec783ad114be4bda07ab062b5779a34133124610cb0bf1