Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9dccbc3f5f3388a…

MALICIOUS

PDF

92.7 KB Created: 2021-09-06 09:06:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 564cd58c981390d503a1f684d42d6b4a SHA-1: cc911b8f1bc35c04be0a741ad0bf439b5aacfc75 SHA-256: b9dccbc3f5f3388a2b01db6acf90877992203d8a9267a2e30882694041c3d937
176 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, many of which point to compromised WordPress upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of external links and the nature of the heuristics point towards an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://ratsimae.eemedia/contents/file/31966496204.pdf In PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aeb48994d0---nijolelojifesavowajiz.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f1c18aea0b4---woreludob.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160b477565e085---ripavatikiwiluwevowuf.pdfIn PDF document text
    • https://diarch.in/WYSIWYGImage/file/vijijenevikivobumewaxe.pdfIn PDF document text
    • http://www.smartlandgroup.com/ckfinder/userfiles/files/dojerunorasaxipajibu.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f5a8fc0dc8a---65953655449.pdfIn PDF document text
    • http://motocams.cz/ckfinder/userfiles/files/retikivakimizirurujon.pdfIn PDF document text
    • https://thaiwoodengames.com/files/upload/files/besajikigaxenofafatumozo.pdfIn PDF document text
    • http://www.morrisjones.co.uk/EditorImages/file/75547721157.pdfIn PDF document text
    • http://wfuchiomega.com/clients/4/46/46a815049f9cfb11ab63b386d19cdfb8/File/gadiludajigusarelizin.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/9cf5b7000a542bba48bfaf0c9b269397/87346276362.pdfIn PDF document text
    • http://cravaluos.com/ckfinder/userfiles/files/dofukimosefunegir.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c6549e9392---80962323377.pdfIn PDF document text
    • https://postelezmasivu-ostrava.cz/ckfinder/userfiles/files/mufidimuwurexutelije.pdfIn PDF document text
    • http://kirsanov-maslo.ru/uploads/bexaribinegoze.pdfIn PDF document text
    • http://cocoal.com/uploads/file/legubif.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/nugovigulaposifuti.pdfIn PDF document text
    • http://bishopsalamatkhokhar.org/userfiles/file/85947194273.pdfIn PDF document text
    • http://polipadel.com/userfiles/file/92483153244.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed5bbd6468---rorenif.pdfPDF link annotation
    • http://campcolefamilyreunion.com/clients/82065/File/60991704372.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/ravuruwudemofus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=pantone+pastel+color+chart+pdfPDF 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_off00010517.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10517 10628 bytes
SHA-256: bc2eefa4ebaae51fe3416ec7ceef3ac14f7bede4e52f67f8d6cc6fdf70bd4f7b
font_01_sfnt_off00011d5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D5D 18520 bytes
SHA-256: 8b2482f9174e1b7cd6e93d69f245a5384b6a6d51a7d0fc22acd52c1e4c3da712
font_02_sfnt_off00014d65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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