Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcda5e8e7e456744…

MALICIOUS

PDF

80.7 KB Created: 2021-09-21 08:51:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 8ccb4fdf6ff3fc7868c96429c4eea461 SHA-1: 5132b7051f2b5f380e8b9c159a6b0e6245b78f26 SHA-256: bcda5e8e7e456744f974882c93c6dbefdd28350f2290754a9f785b216a5e7514
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs that point to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these URLs and the heuristic findings strongly indicate an attempt to lure users to external sites for potential exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://inwebjor.ru/uplcv?utm_term=gta+5+money+and+rp+generator+no+human+verification PDF link annotation
    • http://bernardthevenet.fr/ckfinder/userfiles/files/95561145961.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c518475988---69349940298.pdfIn PDF document text
    • http://maymaygiaydachidang.com/upload/files/jolorikupakapemuzokedukuv.pdfIn PDF document text
    • http://ilink.pl/userfiles/file/sufifoz.pdfIn PDF document text
    • http://marcelponjee.nl/ponjeefiles/file/zifajumaxovoradugepe.pdfIn PDF document text
    • http://proficlim.ru/public/userfiles/file/zopopasatevewunujaf.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138195078b63---tazakejoxoxasiviwuse.pdfIn PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/sipasivabosatadarafe.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/084fec1c2cc809aa7ed32183c50f33bb/gigego.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/bopipijufuwojeremamun.pdfIn PDF document text
    • http://cutyoursupport.com/userfiles/file/42079384855.pdfIn PDF document text
    • https://ntpuvoice.com/ckfinder/userfiles/files/89177311886.pdfIn PDF document text
    • http://belgium-ex.com/images/blog/file/dabijolutibabageki.pdfIn PDF document text
    • http://finance-bulldog.cz/UserFiles/File/bivimumuzutoxuvifigepal.pdfIn PDF document text
    • http://e-hematologica.pl/users/file/galuxeluwavezab.pdfIn PDF document text
    • https://alicantea.centralcms.cloud/galeria/files/risapifuvarusoba.pdfIn PDF document text
    • https://vntdc.com/upload/fck/file/degirexebojupinuraxelusa.pdfIn PDF document text
    • http://euredit-editions.com/userfiles/file/samedu.pdfIn PDF document text
    • http://schokofontaenen.de/idata/genati.pdfIn PDF document text
    • http://centonze-vini.com/userfiles/files/95527533715.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/364fe225480eabc9d6af28d1ea05294a/pugaxop.pdfIn PDF document text
    • http://aisne.proximeo.com/ckfinder/userfiles/files/11332617472.pdfIn PDF document text
    • http://hanboo.cn/Uploads/file/2021091123563870554.pdfIn PDF document text
    • https://www.vasutaszeneiskola.hu/ckfinder/userfiles/files/josad.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_off0000d1ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1CE 18420 bytes
SHA-256: 2fef87c6ad57cad26d3138b5dc18d17ab36e6b0ec32cfa4c404c6548f4c3b119
font_01_sfnt_off0001021e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1021E 11304 bytes
SHA-256: ca58fdc28dc01c473ffdaec59963f09eb4fc2c6b4f6cea7ca33bd4371dfc7169
font_02_sfnt_off00011c65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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