Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a86bdc751ac2abe…

MALICIOUS

PDF

80.9 KB Created: 2021-09-20 09:44:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c81f3760f00cc057c5f8efe34d4334ab SHA-1: 1785ec2f6ff85ea082398bc064a4e3926c9cdb1a SHA-256: 9a86bdc751ac2abe2005c4500ef5185d9e213149825d41cb4ee2223e132d453e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, with heuristics indicating it functions as a link farm. Several extracted URLs point to compromised WordPress sites and disposable hosting, suggesting an attempt to lure users to external resources. The PDF structure and embedded URIs are consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://pixomot.ru/uplcv?utm_term=how+to+send+image+as+document+in+whatsapp+android PDF link annotation
    • http://bamila.vn/luutru/files/tenilopu.pdfIn PDF document text
    • http://eltdb.com/UserFiles/files/rodaf.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd792787d0---mulinawoselam.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/161434c91e9caa---91291232183.pdfIn PDF document text
    • http://archifolder.com/userfiles/files/73651086178.pdfIn PDF document text
    • http://www.mecateengenharia.com.br/ckfinder/userfiles/files/68930350080.pdfIn PDF document text
    • http://kfbma.org/files/fck/file/bifuvotekasidukubudar.pdfIn PDF document text
    • http://humanlitech.com/files/files/zokato.pdfIn PDF document text
    • https://www.autopsrus.com/ckfinder/userfiles/files/32094159448.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16143228b609d9---jademebeparibaxerokuxawa.pdfIn PDF document text
    • http://abwlargo.com/uploads/files/88380169211.pdfIn PDF document text
    • http://rulada.by/upload/editor/files/pizesuwewigejusawili.pdfIn PDF document text
    • https://chiuman-hk.com/images/file/42799897161.pdfIn PDF document text
    • http://jafra-com.at/userfiles/file/juvesozawixo.pdfIn PDF document text
    • https://aiwatopup.com/ckfinder/userfiles/files/mogodesudas.pdfIn PDF document text
    • https://conexusinternational.com/ckfinder/userfiles/file/93880289293.pdfIn PDF document text
    • http://kkc1.org/htdocs/cljr/data/files/wesudatoranepiveva.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/6072697760.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132d1b496773---retale.pdfIn PDF document text
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/dadepevafugodofit.pdfIn PDF document text
    • https://shibbirs.com/media/files/99056202560.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/xivifukimijadupo.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161377589a0a0c---roloz.pdfIn PDF document text
    • http://phutungvespaco.com/luutru/files/rabozuviwepavavesajusoz.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_off0000d4d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D5 11092 bytes
SHA-256: 841de45de10b4c19668e5b8332233234cc1fb34ea539528e45cb9e28bb86ee51
font_01_sfnt_off0000ee50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE50 18120 bytes
SHA-256: 8d89090c9796f7a55e2492072accd37e3e6089947e34b44bd70b5989b91af4ff
font_02_sfnt_off00011d49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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