Malicious PDF — malware analysis report

Static analysis result for SHA-256 a60cecdbbd71eb86…

MALICIOUS

PDF

82.2 KB Created: 2021-09-01 17:11:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c8126b28918c18ed49b9403a6298d87b SHA-1: 4f68861ed3ef37bef1abfb1ddb3412e12af41608 SHA-256: a60cecdbbd71eb86e5d285c9c415fbdd87c33c70128848e8aa417c5c9badc3e5
156 Risk Score

Malware Insights

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

The PDF file contains a link farm directing users to multiple URLs, several of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The primary attack pattern involves luring users to click on these links, which could lead to credential theft or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 http://nuestratierrapremios.com/campannas/file/33922163521.pdf In PDF document text
    • http://ezibra.pl/upload//file/54462512789.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/tepupubazepubafopezop.pdfIn PDF document text
    • https://www.apollopowersystems.com/wp-content/plugins/super-forms/uploads/php/files/35ae6691652fab7a4a83fdd9008b74c4/40709919479.pdfIn PDF document text
    • https://nbcmedia.vn/ckfinder/userfiles/files/gavuwazejagurad.pdfIn PDF document text
    • http://studiopiergentili.it/userfiles/files/25973463147.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079810a25231---1967432613.pdfIn PDF document text
    • http://yakutiaprime.ru/SITE/files/editor/file/ladopozejuvusidagade.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/80758687986.pdfIn PDF document text
    • https://wecareu.net/ckfinder/userfiles/files/26373344186.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160789f603f8ee---jonibupavazusulerijutej.pdfIn PDF document text
    • http://grasslandtj.com/upload/files/42258466580.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/wobuluvuj.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bafe6fe5475---xozeroxujakogimopa.pdfIn PDF document text
    • https://fier-forjat-valimet.ro/ckfinder/userfiles/files/fajasozujetiborozibomupuv.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce852bc923---51232408686.pdfIn PDF document text
    • https://3drm.bg/uploads/pictures/files/11208013684.pdfIn PDF document text
    • http://darec.sk/files/files/3270358115.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/f1031828774b98449f201387f7cdce11/18669944650.pdfIn PDF document text
    • https://www.psk.com.au/application/third_party/ckfinder/userfiles/files/sumaxowobiwutetibovu.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/39a5dac9feeba8b060df9f3ff505468d/70716052206.pdfIn PDF document text
    • http://xn--80aaa1acmiejxr6d7fg.xn--p1ai/data/files/73066110715.pdfIn PDF document text
    • http://veszpremkosar.hu/_user/file/72466125281.pdfIn PDF document text
    • http://jinruily.com/UploadFile/file/20210817121222777.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=need+for+speed+most+wanted+download+black+editionPDF link annotation
    • 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_off0000d7a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A2 18280 bytes
SHA-256: 3c7e87149f9ab998b34dc979b7de98e6d5cf4ec4efc2e304e7be1063fa77330b
font_01_sfnt_off00010667.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10667 11076 bytes
SHA-256: 7a38dd902e2b81f786c0d5736204665154882cde6d51191531536e46666877ba
font_02_sfnt_off0001200c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1200C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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