Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2cf8be74f343b9b…

MALICIOUS

PDF

91.2 KB Created: 2021-06-30 12:19:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 91acaf37f5bc9f64f89037a1c98bd7bb SHA-1: bd24024bed8785d27b8aa7f3d934a6026b15f927 SHA-256: a2cf8be74f343b9b97a0b5ed176c97872eed61d6032be588585630e3e69e222e
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, functioning as a link farm. The primary goal appears to be directing users to malicious websites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://ketchas.ru/uplcv?utm_term=declare+a+2d+array+in+java PDF link annotation
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1607a99ae525b4---96730732521.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/ltb4i7bkk8blt1ba8d23g5jmqq/buwubemijere.pdfIn PDF document text
    • http://brooklynsmokeshops.com/admin/images/file/bagovuwibizota.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16089f52536154---nokaletapulibetaxo.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcd26be0d75---16709499681.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/gc5k2mfvv1bt8esaj8smjedei3/95634602186.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/167f1120fa20aee4ee33319cfe770e80/68768388604.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4aa310421c---potixumajizatadipodeg.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b48dd674b4a---56927820074.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/3c6ea3f9cff801356a4479dda1a63936/doxaniragobilekudavow.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///giganupeximogolefelo.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/bb3420f2eef2b933f88c19a030fd125c/17167543349.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/94080014788.pdfIn PDF document text
    • http://doubletroubels.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071e55274194---46631278228.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/gueadbg0pg17hfbj1jvmdv4pc9/88739808825.pdfIn PDF document text
    • http://olympicburger1988.com/uploads/files/petumojeg.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082acca33dcc---63999124398.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/bea546aa516e5aca6583920169a23405/10960100796.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160949cb9c6098---pemolexido.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/bomazamonipuxe.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/a1fc406b31eece362d9b8ac3add5de06/rararagezevafewegir.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/de1d7853f82c415431cb1f56156651cd/53029551833.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1608edbc1578bc---gajuxolukujojakaxis.pdfIn PDF document text
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/7944660718841ad6e1be0c7d29d05413/66329763378.pdfIn PDF document text
    • http://nusratali.com/userfiles/files/zovevid.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_off0001000a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1000A 17524 bytes
SHA-256: 525910f5c1b95cc57cb576c8a8087e41f22075f4c1daba011bcf732fc751b1b0
font_01_sfnt_off00012e77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001468e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1468E 10408 bytes
SHA-256: b4b871fd27be7e873b0cd5440912da6af1bf12fd32c0c43ea2d96b67f6bc602d

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