Malicious PDF — malware analysis report

Static analysis result for SHA-256 579dd2c8328422a0…

MALICIOUS

PDF

77.0 KB Created: 2021-09-04 07:08:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7e3f17c9bedaa5a051ad333ea632bd80 SHA-1: c64921690c7d6cd11fafd4d65d6868186771a9b2 SHA-256: 579dd2c8328422a06d04ddabf77b2e9dc3da113c6b5a88e468a4d44cb4d1d64c
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable domains. These links likely serve as lures for phishing attacks or to distribute further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://laborke.ru/uplcv?utm_term=consumerism+and+the+environment+pdf PDF link annotation
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/468be5d26a918ff02943821cc9e63c06/15954588322.pdfIn PDF document text
    • https://coimbatorepressclub.com/FCKeditor/userfiles/file/filupilufisega.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/fipexajukiroporavebir.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f4e1c52bff6---67453685074.pdfIn PDF document text
    • http://mlsy.cz/images/file/files/dowobo.pdfIn PDF document text
    • http://uppercanadatwocylinderclub.com/clients/877835/File/29237516826.pdfIn PDF document text
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/38566926720.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607623965298d---63850281324.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/5809001231.pdfIn PDF document text
    • http://chamdure.com/DATA/files/58297181471.pdfIn PDF document text
    • https://ozsersogutma.com/upload/files/16050644512.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/gelisozunugo.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/ttgr4ltldt7ugfmv3ofakm7ufi/jeredoka.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160af99c124735---lukomoxega.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/1bbe36ee8d4e5b6d32032f67551aabcd/20912618933.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/871c49502fa8589767549716d2abd747/javola.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/8e01802af7afce9a63a1052164835c15/87369058376.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cca5ead58ab---basem.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160751d0b4817a---lusizebijorigukorobal.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/e49b0c75c296aac23ec4400d57c56728/rijefinujafetekepitison.pdfIn PDF document text
    • http://shbaicun.com/userfiles/file/2021072812180673499.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/9cfcf86a3d1ef8b43b120f31777cdcd1/83410886718.pdfIn PDF document text
    • http://ijdssymposium.eu/upload/litab.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0d742accfa---notafazijevo.pdfIn PDF document text
    • https://koratspring.com/upload/file/bemana.pdfIn PDF document text
    • http://remont-etalon.ru/upload/files/fatogegepafewujalujuw.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/6032qlv20oudu8n5ousmjm4mh1/nazumepukijopuvap.pdfIn PDF document text
    • 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_off0000c9ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e1fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1FC 16912 bytes
SHA-256: 0a583fd8718f1d77588c799f39363deb12fd0a8a048e05251adde177e080d150
font_02_sfnt_off00010cea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CEA 10916 bytes
SHA-256: 4fe12dd129418c47da01d2bf15af8b72393609920b7bedc1c2e9c622df7513c7

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