Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dab0ed6761e5c1a…

MALICIOUS

PDF

112.2 KB Created: 2021-09-04 20:14:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 23e06a6a0842d9283c810b4bb4931cdd SHA-1: 98a7a52d0a1ff43b86344733079f2e1152c51ef7 SHA-256: 5dab0ed6761e5c1a39fc501035da47dcf6682dcd741052339138df2df94dc581
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. It contains a link farm pointing to numerous websites, many of which are hosted on compromised CMS platforms or disposable hosting. The primary function appears to be directing users to external URLs, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 http://extracam.es/app/webroot/arxius/file/67311851921.pdf In PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607b01f77c70b---16817977927.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160c8dc1fb5d82---vimobitamuwupunu.pdfIn PDF document text
    • https://locoffice.ru/userfiles/file/66670509056.pdfIn PDF document text
    • http://mintaialuminum.com/d/files/vuforimor.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/suxok.pdfIn PDF document text
    • https://pragatitic.org/ckfinder/userfiles/files/sewedutozu.pdfIn PDF document text
    • https://bursakaynak.com/userfiles/file/84286120808.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/ea6881c3fc3f5e8cedaaf244d903797f/51405956532.pdfIn PDF document text
    • http://olgapolyakova.com/files/files/82497162013.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607739a392c08---jokerolosa.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/migefurulekufi.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/zikajusix.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210502181558_1787223155.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160759afc01188---32059733165.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160983d9b4fdbb---61464748805.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dafea7531ca---fimakozikuvuxugomal.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/9fa1b1a564f429d4c85c1512db203276/gopirimesobawapetipaxa.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609111f28d8af---10695366419.pdfIn PDF document text
    • https://bharatbiodiesel.com/userfiles/file/wifefadapolobamiro.pdfIn PDF document text
    • http://arlingtonhigh1961.com/clients/e/ef/ef36f0800c0a5d5a0b00d5ecc8c3c6da/File/sakaxew.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/zolopudolipuse.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ucgb12vghg8ti97jcpbj0ndmt2/riketoxulogokureb.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/97766082721.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=netgear+r7000+manual+setupPDF 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_off00015275.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15275 10632 bytes
SHA-256: 87ff4f8c3aad8ebcedcef42f679d2023b8db7460351e8b6bd20c2b5830a623e2
font_01_sfnt_off00016ade.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16ADE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000182f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x182F0 18248 bytes
SHA-256: 03ff1266bc527cc579a1c33f41e295cf1c9a174fb72c652c283133132768d738