Malicious PDF — malware analysis report

Static analysis result for SHA-256 c878ca4feedd3aec…

MALICIOUS

PDF

83.8 KB Created: 2021-09-18 22:14:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9509ef6f700b58119ece3e9d7201dcd9 SHA-1: 1d386a1bcc95196c12813d73a99cf9b689cc37f6 SHA-256: c878ca4feedd3aec0b766056224cc7d185612f9da8b7acdc1ca3c47d8a9d38a5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to compromised WordPress sites and disposable hosting, functioning as a link farm. The primary purpose appears to be directing users to malicious content, likely for phishing or malware distribution, leveraging the 'utm_term' parameter for tracking.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://infrive.ru/uplcv?utm_term=the+escapist+2+apk+download PDF link annotation
    • http://morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143c91a27603---4917245969.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/3a63042fddd0713715cfc29f638f1119/torupijuzemixutesero.pdfIn PDF document text
    • http://wwsm-hk.com/files/file/43825334015.pdfIn PDF document text
    • http://tnmetalworks.com/images/files/37743751108.pdfIn PDF document text
    • http://suphammamnon.org/uploads/files/10341198831.pdfIn PDF document text
    • https://hiddencliff.kr/FileData/ckfinder/files/20210914_13DA3D265B64E544.pdfIn PDF document text
    • http://www.integra-cr.cz/administrace/ckfinder/userfiles/files/86111222058.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/658428f50a28fc251c1812d30f05f6ff/19594502378.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/rlup729niah184sa1jqkui2pu1/77008457849.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/161446b5778b97---xedemesekudo.pdfIn PDF document text
    • http://goksirkrupskimlyn.pl/img/upload/files/90291341594.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/161332071bdc0b---63532560412.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16140e696f38ee---letulesowid.pdfIn PDF document text
    • https://mldom.xyz/web/img/podborky/files/gipawijiriwigewum.pdfIn PDF document text
    • http://dragoniresorts.com/userfiles/jivelogajopidatufatele.pdfIn PDF document text
    • http://ekonopuntos.com/campannas/file/52348026122.pdfIn PDF document text
    • http://irodaszer.lukinserv.hu/file/95443531875.pdfIn PDF document text
    • http://bestpokeya.com/uploads/files/77690226104.pdfIn PDF document text
    • https://hotnewsmd.deca.md/upload/userfiles/files/womatonujopelig.pdfIn PDF document text
    • https://losungversorger.com/product/file/14791455588.pdfIn PDF document text
    • http://www.cavice.fi/tiedostot/files/veranifimifuv.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16140e68d38ad2---6745378269.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16132b969344e7---30090985557.pdfIn PDF document text
    • http://pieseclimaauto.com/files/file/49117356814.pdfIn PDF document text
    • https://villatoscana-pi.it/userfiles/file/silinal.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_off0000e04b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE04B 18528 bytes
SHA-256: e9771b36dfa7df3b8588d783ff7f2548a943ff0ce8ae45d1ff094f13688f34e6
font_01_sfnt_off00011068.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11068 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001287f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1287F 10772 bytes
SHA-256: f2d438249d3b3fbd685594eafd76d95a392a933d5fb870683f5bf7e1fb106cc4

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