Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1d1c52067e71b3c…

MALICIOUS

PDF

70.6 KB Created: 2021-09-24 20:57:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 613fb15b1ca29e62ec97dd111dbb5029 SHA-1: 905670f44fee672ef1e4f171b623c12219a020cd SHA-256: c1d1c52067e71b3c7ab2a3b5fff831c7e63603b89b2140dbfd73e77c7fe526de
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 websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of a link to a compromised WordPress upload storage further supports this. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.patriarca-batiment.com/ressource/site-image/files/pusukowowinovumez.pdf In PDF document text
    • https://resttour.com/images/userfiles/files/28475365398.pdfIn PDF document text
    • http://anpharma.net/upload/files/98464685445.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/69353444166.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/zomoditidatekiba.pdfIn PDF document text
    • http://www.boldino-hotel.com/ckfinder/userfiles/files/34082478511.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139068875681---45069352825.pdfIn PDF document text
    • http://salman-is.com/userfiles/file/51704406236.pdfIn PDF document text
    • http://alt-1c.ru/userfiles/file/65919588639.pdfIn PDF document text
    • http://terremeraude.com/userfiles/file/juwilisiwejopopuponumexok.pdfIn PDF document text
    • https://maxlinder.com/admin/assets/ckfinder/userfiles/files/kupobo.pdfIn PDF document text
    • http://volker-issmer.de/userfiles/file/pupaxupowa.pdfIn PDF document text
    • https://petandpuppies.com/userfiles/file/dajonibetigomesuzobafezur.pdfIn PDF document text
    • http://gajagotour.com/UserFiles/file/87474394194.pdfIn PDF document text
    • http://eminenceinc.com/userfiles/file/womekaret.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1614d851a4f1d8---42218152376.pdfIn PDF document text
    • http://ambvetsanprospero.eu/userfiles/files/bilemop.pdfIn PDF document text
    • https://korvioinfotech.com/ckfinder/userfiles/files/23050875252.pdfIn PDF document text
    • http://rrarental.org/upload/file/gopuzagoxinojekijojeje.pdfIn PDF document text
    • http://iltorg.ru/upload/file/88175902767.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16132e3104f069---12424405566.pdfIn PDF document text
    • http://worldprint.su/userfiles/file/xusijevire.pdfIn PDF document text
    • https://marikakozmetika.hu/editor_up/26186349103.pdfIn PDF document text
    • http://lrm.mcdonalds.ua/ckfinder/userfiles/files/jemefuketebeka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=snaptube+apps+installPDF 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_off0000b151.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB151 10340 bytes
SHA-256: 9def88531103f89de946390496577cbf04173c6ad80f4adae03bb8439734875e
font_01_sfnt_off0000c887.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC887 17004 bytes
SHA-256: 7f70b12e6d5d6cd4b00e3bebef783464ce35d9b31eb15239d25430c74e4fdd30
font_02_sfnt_off0000f3c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1