Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad5c4587038ca481…

MALICIOUS

PDF

87.1 KB Created: 2021-10-07 00:03:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 514bc3cc8849236c1e57b04b84ade343 SHA-1: 4894c762d13f60a43965b59cc782175b5d36fb4f SHA-256: ad5c4587038ca481b5edd95fba73066d6a2662a8ca047798eed3c42356ce13f7
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload locations, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The document body is unreadable, but the heuristic firings clearly point to a malicious link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://mobilpetrol.olajpark.hu/files/files/woxusigebet.pdf In PDF document text
    • http://af.ssla.ru/images/fornews/files/56175924502.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161557b972dfc9---83350443259.pdfIn PDF document text
    • http://kondicionery-elektrostal.ru/upload_picture/file/87419266320.pdfIn PDF document text
    • http://sanfrancescovet.com/userfiles/files/maxadeb.pdfIn PDF document text
    • http://trendstyleimage.com/uploads/ckfinder/userfiles/files/rubenikekidejem.pdfIn PDF document text
    • http://nifaelectronics.com/userfiles/file/92042017772.pdfIn PDF document text
    • http://saveondealz.com/ckeditor/ckfinder/core/connector/php/uploads/files/95310830167.pdfIn PDF document text
    • http://coreaad.com/DreamDataUpload/file/79377696655.pdfIn PDF document text
    • http://bdpq.hungminhits.com/files/uploaded/files/67700880067.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/80323642285.pdfIn PDF document text
    • https://funbugs.ie/userfiles/file/dotixibodedep.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/92012253777.pdfIn PDF document text
    • http://ck-buhgalter.ru/userfiles/file/goriwamekawumonivovu.pdfIn PDF document text
    • http://udmvdpo.ru/images/files/nanamog.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/6ba718657ac1f285b139f4f01a835b44/xoligezuvuxanujuzuwevox.pdfIn PDF document text
    • https://menuiserie-sainte-anne.fr/userfiles/file/benuxavas.pdfIn PDF document text
    • http://www.addvanceo.info/userfiles/files/dupedexukurilabazi.pdfIn PDF document text
    • https://jmbarrenetxea.soinuenea.eus/files/galeria/files/divexivemololosodilo.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1615894192e95d---weduwutiditojo.pdfIn PDF document text
    • https://marsanz.pl/uploads/fck/file/fazokaxet.pdfIn PDF document text
    • https://nurdagihaber.com/resimler/files/36194860256.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+get+all+data+after+factory+resetPDF 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_off0000ef97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF97 18004 bytes
SHA-256: c997066d7eb1444539a0c2ddf5b1104788dd60987e40bd886d375a30cf9b19f7
font_01_sfnt_off00011e2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E2C 10648 bytes
SHA-256: 508fdb7c50d8e28c4fb5d2cc2bae32e1fd6f3a9da0edaf70c526f1340c776546
font_02_sfnt_off00013696.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13696 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1