Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d4478959d8c1962…

MALICIOUS

PDF

98.6 KB Created: 2021-07-05 07:54:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d670ce5b47cce0c4e6f027e5ab50d85b SHA-1: 01bee7e937f182fed7aa6cef22e961cf09b98122 SHA-256: 9d4478959d8c1962795c957b7423c490d377f90a344d2128e7296bef9e496067
156 Risk Score

Malware Insights

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

The PDF was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting it's designed to redirect users to malicious sites. No scripts were extracted, but the overall structure and URL findings point towards a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9784

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.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160bced936061b---pugir.pdf In PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/5ecdc08c96e07c225ba4b29157dbd625/kitudenasijedatogavata.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/3169fb70c15b8f8210bdd6f7dab38c63/76800980570.pdfIn PDF document text
    • https://pristineleather.com/userfiles/file/fofufogokewerotitenewaxez.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090f720cbbef---raweviwunakazanilazefoxo.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/247005b6b17090250c075a1756f0a705/4514589763.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/97953069159.pdfIn PDF document text
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/vobajomewuw.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/5328140cef2e164c331b12f35d1f0dc1/meluwomigixoluxibut.pdfIn PDF document text
    • https://cailux.lu/userfiles/files/xesamibabufovugijix.pdfIn PDF document text
    • http://hbleg.com/admin/userfiles/files/nupifi.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/kerelufofolajobudiwarepi.pdfIn PDF document text
    • https://dm288.rs/slicice/file/giguzipoxasexagev.pdfIn PDF document text
    • http://uralinteh.com/uploads/files/xisogemokiwig.pdfIn PDF document text
    • http://raiders71.com/clients/4/41/4134020f2f298c111575624a380fabfc/File/46696554230.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bfcee38398d---nofofuzumulibizatovuki.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd2b039350---tesawi.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c5f3236ad62---bopasizozanunosodalojefo.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608aaa819c96e---suzagiva.pdfIn PDF document text
    • https://marjoyunlar.com/calisma2/files/uploads/bezodomidije.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/93669909294.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16073e23a43903---kupejatod.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/2764593c86abdb14f5bbdca42d690c49/levagunebefo.pdfIn PDF document text
    • https://j26clean.com/upload/files/16442099196.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/fegoxuputitubamilo.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/77773f4e3e4c0c79bb6d6af6a8952420/75595746094.pdfIn PDF document text
    • http://paradisoseminatrici.it/userfiles/files/64869637818.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=conjoint+obligation+examplePDF 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_off00011c70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013487.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13487 10732 bytes
SHA-256: ceb5b30096a25afa8e21a9a082891dab55f184e6c13e0039637a0f46b96681fc
font_02_sfnt_off00014cf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CF6 18140 bytes
SHA-256: 404b9f719fe41edb827aa65657e41eafb22e628caf79e1d900fee5a452c954a7