Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae8d7c1cfc4cbfbb…

MALICIOUS

PDF

78.4 KB Created: 2021-09-15 23:16:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e0f34b029ada04af005d5a60aabc58bc SHA-1: 265286caed09b16a40de9a1a3f77a809cf33eed3 SHA-256: ae8d7c1cfc4cbfbb569fe7b444d616eb7e54bf45137fd6d5428fe1d1a040b402
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://cructi.ru/uplcv?utm_term=open+board+for+android PDF link annotation
    • http://tekizolasyon.com/ckfinder/userfiles/files/zunizedi.pdfIn PDF document text
    • https://sua.vn/uploads/userfiles/file/26679232204.pdfIn PDF document text
    • https://latgalesamatnieki.lv/files/file/12155671363.pdfIn PDF document text
    • https://luckyfood.itweald.com/uploads/files/613a8abf630af.pdfIn PDF document text
    • http://hotelrefah4ter.ir/basefile/hotelrefah4terir/files/bejudege.pdfIn PDF document text
    • http://jiachuankeji.com/upload_fck/file/2021-9-14/20210914013843386120.pdfIn PDF document text
    • http://lerucherdesanges.fr/userfiles/file/puviwigotuwidu.pdfIn PDF document text
    • http://eaas-journal.org/survey/userfiles/files/90770080852.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/daa872df6f6bca84283355cc2b1847a0/kewugixofukisotamuw.pdfIn PDF document text
    • https://marcuspietrek.de/MARCUS/files/file/vomemomubagetadidimegurol.pdfIn PDF document text
    • https://pui-vital.ro/msg_media/file/38312611558.pdfIn PDF document text
    • https://mekongtransport.com/upload/userfiles/files/nozefes.pdfIn PDF document text
    • http://xn--eyt274i.com/upload/files/77382347564.pdfIn PDF document text
    • http://nwatchonline.org/userfiles/file/likurasiwupasiri.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f89595344a---17442768521.pdfIn PDF document text
    • https://dukra.sk/editor_uploads/files/pusiforejepiramit.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/21503679221.pdfIn PDF document text
    • http://primebrokeragetx.com/ckfinder/userfiles/files/majimawebitudixepekoviwat.pdfIn PDF document text
    • http://perfect-gallery.com/userfiles/file/92854783548.pdfIn PDF document text
    • https://medius.sk/userfiles/file/gakip.pdfIn PDF document text
    • https://thefertilizergranulator.com/d/files/wesuwigivalejoderajolu.pdfIn PDF document text
    • https://congchung7.com/upload/file/84047036299.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161337901e2957---21889923562.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/161346151176d5---pajujubezusimozesiramike.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_off0000d35d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD35D 10344 bytes
SHA-256: dff35e214c68172e13fb3350c0f777de8fcc2f12e1f1a2a2ddc1f94230751eb6
font_01_sfnt_off0000ea87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA87 16148 bytes
SHA-256: d60764dc06109b292b11872dc52f59a5eab646d06bc661b835f4a0675d19f23e
font_02_sfnt_off00011468.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11468 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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