Malicious PDF — malware analysis report

Static analysis result for SHA-256 90284c8b43a9f691…

MALICIOUS

PDF

92.7 KB Created: 2021-08-06 23:56:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: aa0b61672bde1bd0f65e890720648efa SHA-1: 62439487f58f15382f3328d70b848d0f25ce5bd0 SHA-256: 90284c8b43a9f6911dc57e93ee485a29b98bc7855f02ce01a9ae00c957c90893
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites hosting further malicious PDFs. The primary purpose appears to be directing users to these compromised sites, likely as part of a phishing campaign or to distribute additional malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://wastran.ru/uplcv?utm_term=how+to+cheat+in+bb+racing PDF link annotation
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/23460de1c72058ab0187e8edd55d0676/zapusawumorelosevefoxedu.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8b9d82fef9---56101160732.pdfIn PDF document text
    • http://e-skala.pl/userfiles/file/41456621070.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/snkunmsv4mjocsehobpo91fns0/xatesemelodefutir.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16089b83acc203---fufobodoki.pdfIn PDF document text
    • http://weberstellen.ch/userfiles/file/88294036225.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/24318249435.pdfIn PDF document text
    • http://accronline.com/userfiles/file/21029449354.pdfIn PDF document text
    • https://linardi.ru/files/file/gejajafafumulivilapuwu.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9b9beb1d71---84482606496.pdfIn PDF document text
    • http://nhadatv.com/webroot/img/files/85450061708.pdfIn PDF document text
    • http://magooferta.pl/uploads/fck/file/16410854777.pdfIn PDF document text
    • http://promocode.lu/userfiles/files/sukigesonolo.pdfIn PDF document text
    • http://ingpoggi.eu/userfiles/files/bozivudu.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/kujagitufa.pdfIn PDF document text
    • http://dangkykinhdoanhkiengiang.com/upload/ck/files/99127534503.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5bcbb672f---keliduve.pdfIn PDF document text
    • http://dfh-consulting.com/userfiles/file/mumejadef.pdfIn PDF document text
    • http://thepokewave.com/uploads/files/nikejamuzazaxomin.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d503cd8eb---nupazu.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/lunfll7fa1q1sjd6vdbs5100pm/sevejovedo.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160768618b4926---33608993572.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000104ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104BA 10512 bytes
SHA-256: 05c6e0577209a7b8b9d12d20b7611a5e947a94611dd7f1903f712db94976ab84
font_01_sfnt_off00011c9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000134b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134B0 18056 bytes
SHA-256: 59605dc69552f1ee0e97d135ad4783f08426442f9946451d7413d13c50c66df9

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