Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cb52cb7c8b51b57…

MALICIOUS

PDF

103.8 KB Created: 2021-07-05 13:21:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4f203bb47594a334112e9004f56f4402 SHA-1: a57c9117312ff67e6978f53d7d05cb35ba47c53b SHA-256: 1cb52cb7c8b51b57d49e5f7d9009fad3295d6472d8e65dab1d0f036a67e0329e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites and disposable hosting, forming a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://allytemp.ru/uplcv?utm_term=china+rich+girlfriend+pages PDF link annotation
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c87c889497---womasumadinibelatidezit.pdfIn PDF document text
    • https://mebelihome.ru/upload_picture/25786228660.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160abd630192e9---baloxuzosufibubefuxebiwib.pdfIn PDF document text
    • http://universalestetic.com/userfiles/file/88645248173.pdfIn PDF document text
    • http://com123.vn/uploads/file/84534335693.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/cf4f9e0bc1ef7266118d123908f0dfb1/xonazamiti.pdfIn PDF document text
    • http://lbhodgereunion.com/clients/3/38/38e1f81cb1ac74d12d86c8ba87866b9f/File/mirin.pdfIn PDF document text
    • http://harryreichert.de/uploaded_pics/News/file/92726889565.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/681b14e9808b4938817118a51006e637/49002176047.pdfIn PDF document text
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/cb7d5b8419a2efe9970233eb6c5964e4/fitevixigabe.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/68f70a0580fcd385270238d77685496d/zenevefuzujorokuzes.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160779d420501a---fujanubemuvukuje.pdfIn PDF document text
    • http://papianiarch.it/userfiles/files/joxadodasul.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e053ddb13d5---98436196205.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609da7318598a---85383104626.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607236b42befa---65156890918.pdfIn PDF document text
    • https://webmenuplus.com/images/file/jakawanofojamaret.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/160bf8adce0e39---7151080531.pdfIn PDF document text
    • http://www.vandiestbrandstoffen.be/uploads/files/22145405251.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/p0ru2f9s0u9c92nqlqpniqmls0/47644833298.pdfIn PDF document text
    • https://faprosid.com/file/raxitoreliwenedinaderebak.pdfIn PDF document text
    • http://studioassociatoemc.com/userfiles/files/jinukotagofomitalifavun.pdfIn PDF document text
    • https://777mto.com/contents//files/96730757897.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_off000132f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132F4 10712 bytes
SHA-256: 25517140962867e2e642e1e224daec3caf50583d05cb02e389c48bbcfa7d780f
font_01_sfnt_off00014b3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B3F 17912 bytes
SHA-256: 3d998a582f9f7619d3b8d10c1aa3bb686a2eeb8d069632a7e811d325755aa5d7
font_02_sfnt_off000179e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x179E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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