Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3d0fc02ca09873a…

MALICIOUS

PDF

81.4 KB Created: 2021-09-17 16:25:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4455e329629d57b3bc0328e7db7d35c7 SHA-1: 8b0898293efc58cc498a39bcdf88aeca36fc3f2b SHA-256: d3d0fc02ca09873a465e3967a78f60b5e0ca776cc3beb711ff87ae95b798f224
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with multiple heuristics indicating it functions as a link farm. The embedded URLs and the PDF structure suggest an attempt to lure users to external sites, likely for phishing or to download further malicious content. The presence of external URIs and compromised CMS upload links points to a distribution mechanism designed to obscure the true malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://philabc.ru/uplcv?utm_term=terminator+dark+fate+123movies PDF link annotation
    • https://flomogroup.com/upload/files/8975779877.pdfIn PDF document text
    • https://hunglivet.com/uploads/files/202109081626509025.pdfIn PDF document text
    • https://www.leadercaravans.com.au/application/third_party/ckfinder/userfiles/files/zeloza.pdfIn PDF document text
    • http://imaginove.eu/data/Files/92039875907.pdfIn PDF document text
    • https://lorus.rs/files/88756144546.pdfIn PDF document text
    • http://kkc1.org/htdocs/cljr/data/files/sixulej.pdfIn PDF document text
    • http://aisne.proximeo.com/ckfinder/userfiles/files/zujajigudarogiketu.pdfIn PDF document text
    • http://dokturmice.com/ckfinder/userfiles/files/kurumosadizudinozukozinu.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/vgj3carqsvkvnm4t4cr0ikdilc/pufetesizu.pdfIn PDF document text
    • http://vincitydata.com/uploads/ckfinder/files/63022975737.pdfIn PDF document text
    • http://sevenseahotel.com/uploads/images/files/godezarizusizud.pdfIn PDF document text
    • http://ambulatorioveterinariorigolon.eu/userfiles/files/40031987365.pdfIn PDF document text
    • http://bbhshipyard.com/userfiles/file/25892133284.pdfIn PDF document text
    • http://vijyaiprismcrm.com/userfiles/files/72720787738.pdfIn PDF document text
    • https://kaunas.cvzona.lt/resources/img/files/kowomobirelizugamujog.pdfIn PDF document text
    • https://hanurichurch.org/ckfinder/userfiles/files/bexikejubovuwab.pdfIn PDF document text
    • http://giayviettri.com/img-ftec/files/78178036580.pdfIn PDF document text
    • http://fosterfreezesantarosa.com/uploads/files/sepototorafodosikedileto.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/50597900800.pdfIn PDF document text
    • https://jaukiaplinka.lt/ckfinder/userfiles/files/zopaxubazejegojuta.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/lkgbnherju63nkkt1cg14tk8oo/55456383022.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/1487a247e748b5765ea4e7995cb8c521/4643369503.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b826.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB826 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d038.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD038 22432 bytes
SHA-256: f71ea206118fd38fda87c2ad99314f2b33203f31f29e015a35c299a75d4d9648
font_02_sfnt_off000107d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D4 16316 bytes
SHA-256: 240e91d3c93f322874c8ecf578a5ed642992a167f318b37a8fb03d157e744a92
font_03_sfnt_off00011e2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E2D 10932 bytes
SHA-256: c147b5321bc2001b8844beb5a27f56c66ac6a096878d37f0b4ad28b8882030c7

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