Malicious PDF — malware analysis report

Static analysis result for SHA-256 53a4d2b3cbb582b0…

MALICIOUS

PDF

109.1 KB Created: 2021-09-03 20:30:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 61106c24c3919125a581e063e2065d12 SHA-1: 3451ce1d33501e317dbb98bd95819dacbd8be301 SHA-256: 53a4d2b3cbb582b0a3fb90a16a2fc196826e0371af75c982171fd4af799f26bc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to various websites, including those hosted on compromised CMS platforms. The presence of multiple external URIs and link farm heuristics suggests a phishing or redirection attempt to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://huntic.ru/uplcv?utm_term=osteomielite+aguda+e+cronica+pdf PDF link annotation
    • http://studiocommercialedelpiano.it/userfiles/files/28809581801.pdfIn PDF document text
    • http://nepodoshlo.kz/ckfinder/userfiles/files/6226158137.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/vqqfaa70i2jh8tmh0fv5aq364n/bobulomo.pdfIn PDF document text
    • https://euinsuti.ro/app/webroot/files/userfiles/files/15179322503.pdfIn PDF document text
    • http://grabnerestriche.at/nonazigin.pdfIn PDF document text
    • http://mutitar.com/user_img/files/latidudisosi.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160d1d3c93f892---40097147276.pdfIn PDF document text
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/sakotutod.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ddea2e6390d---34617029963.pdfIn PDF document text
    • https://spiuruguay.com/ckfinder/userfiles/files/67591788821.pdfIn PDF document text
    • http://xn----8sbfhu6ab4bqv.xn--p1ai/userfiles/file/papavulapitevuvudoru.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c9684153616---99876077459.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/negawoximojugem.pdfIn PDF document text
    • https://consultingexpert.eu/fckeditor/userfiles/file/88152943546.pdfIn PDF document text
    • http://azseal.net/uploads/userfiles/file/34832838581.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f47d7c2db8---bonunemupap.pdfIn PDF document text
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/vodisixuxuzir.pdfIn PDF document text
    • http://yejida.com/userfiles/file/gomusar.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/e0fe726cdad05c2d4555eb37e430627e/zanuni.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/rowidubarurip.pdfIn PDF document text
    • https://davnosti.ru/upload/jesovebagojupu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3eead97930---70081368926.pdfIn PDF document text
    • http://bulongvungtau.com/media/ftp/file/wukowapamofovinu.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/nrkomhjgcu671dp2f61qnf0ai2/59518805613.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_off00014180.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14180 19336 bytes
SHA-256: 9a16e7b32f3aa2252e6300a3508c3c0d33e42f75c1ecb62e084286c94b890766
font_01_sfnt_off000174a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x174A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00018cbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18CBC 11088 bytes
SHA-256: ab681fb891387c0327aa69217e74f6e053a706d6b6bece801cb818dae0582f28

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