Malicious PDF — malware analysis report

Static analysis result for SHA-256 35ac5d1fb8b90c84…

MALICIOUS

PDF

93.8 KB Created: 2021-08-07 07:45:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 46acb657a57a5b1bcc9c79a5d39e0ed7 SHA-1: f34a351061d72f8469148816c028f8eb6833110a SHA-256: 35ac5d1fb8b90c84128b8292eae58592a72dc88b5cae0e82927601af975e6fc2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a significant number of links pointing to various domains, many of which appear to be compromised or disposable hosting. This structure strongly suggests a link farm designed to obscure the ultimate destination and potentially distribute malware or phish for credentials. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://combrooncom.com/contents//files/tulubizegovodipuj.pdf In PDF document text
    • http://khangvietdn.com/uploads/file/zibamulor.pdfIn PDF document text
    • http://studiosimonepantaleo.it/userfiles/files/52725394975.pdfIn PDF document text
    • http://smithmaloney.com/clients/3/32/32eae1a42220421eddab78da2f55685d/File/furavalev.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/f371ea322f325eb5b9a74ec7fe756ecf/94636694058.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/51bbc6da5e47fb3becde9296f84c9c33/rokoxakoninuba.pdfIn PDF document text
    • http://kamnitikamini.si/upload/files/79453813452.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cd9f12cb4d703b9556f8846b8e08a144/xotibagurunefekuxi.pdfIn PDF document text
    • https://megatekspb.ru/sites/default/files/uploads/zetoluf.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/e2bb8bf881fc2c8b0ac10eebc2d8b16c/95484590865.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1606f09feedfb7---49899452428.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af60908078c---34116998544.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/9e94cbf7c6d4f1973d30b43ae646c9da/nekubukix.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c531d450099---derazawaf.pdfIn PDF document text
    • https://mygo.com/ckfinder/userfiles/files/kelusikomasom.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160afff3cb6d0f---21035071047.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/gugafelavoretibubamofitok.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/16109f138b4b05---61211806260.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f99068fca---legolowivedada.pdfIn PDF document text
    • https://cristalensi.com/public/File/dovuvodisazitejamub.pdfIn PDF document text
    • http://cjcounsel.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rupadegolilepozumamigixex.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/d8c8457c7b08ca1551e3f945005d969d/xugirerinejuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=evaluation+histoire+cm1+celtes+gaulois+grecs+et+romainsPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C6 18540 bytes
SHA-256: 8898aa1932bf4ebc894e4d5b7faf7fa33a0efe779c7ea70181a6950e0999d341
font_01_sfnt_off00011f1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F1B 16312 bytes
SHA-256: 7d15b2d6d265aaca51dda18faee70a1b8fa9d95ed54cb111fb0895789092f9ae
font_02_sfnt_off00013526.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13526 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014d3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D3D 10876 bytes
SHA-256: b35702d6168d931106b120afe21dd7254b8834dfa8bd9ce149e3b59cd23d9680

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