Malicious PDF — malware analysis report

Static analysis result for SHA-256 5840314cc56e9ead…

MALICIOUS

PDF

72.6 KB Created: 2021-09-03 14:24:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: de2f8567e5bdad238dfa3c17d342ee7e SHA-1: f39f31263dc519da5c9834bd9bbc64cc6f6e3ee0 SHA-256: 5840314cc56e9ead97424fccc6cf8f96b9da415dbf62f1b067d34834191ce3c2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous embedded URLs pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution campaign. The document body is heavily obfuscated and unreadable, but the presence of a link farm indicates an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://queure.ru/uplcv?utm_term=weill+marchesani+syndrome+pdf PDF link annotation
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bb9d6e78c62dec217b0c216db8aced9a/ladot.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d871c0af56---41446057616.pdfIn PDF document text
    • http://wisdomtours.net/upload/file/gumiwajetu.pdfIn PDF document text
    • http://laboratoriologos.it/userfiles/files/pazaparubimumixukasomeze.pdfIn PDF document text
    • http://kino-cosmik.ru/sadm_files/10588584776.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/ed5427842b91fff1f8a2c61e6c0d2000/widuxiramoluwomululojela.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/04c968b58223686305873b2cc40600b1/tapulojabales.pdfIn PDF document text
    • http://africareview.in/userfiles/file/wiwakifusanixurorobekutid.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c85224364b8---zilifazaxopopo.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081f515b321a---91370562482.pdfIn PDF document text
    • http://omg.su/upload/File/nesojovizerobafupemino.pdfIn PDF document text
    • http://yngc.ru/admin/ckfinder/userfiles/files/kubod.pdfIn PDF document text
    • http://showplus.ae/userfiles/files/35030875088.pdfIn PDF document text
    • https://tatvan.in/userfiles/file/54305981942.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/6150e2e5432ce9c79551f81c5f18eae5/samapubilaronekuwamafu.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/6a9hr10ad5kfcd51gref03lh0a/24966858989.pdfIn PDF document text
    • http://szjwwj.com/userfiles/file///gabisafukebizego.pdfIn PDF document text
    • https://tekmaker.com/upload/files/davoda.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/a7o9gdvvsdmndb98ls9hqtj565/88502470738.pdfIn PDF document text
    • https://petikdaun.com/contents//files/33247901120.pdfIn PDF document text
    • http://clinicaveterinariagoitese.it/userfiles/files/goditemene.pdfIn PDF document text
    • https://contact-house.com/fckeditor/upload/file/xakofedada.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/j0sjhne44llrb73i0200c2dut7/95936002031.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/0ba2d2fa9175dcb1d96189fc896a2e80/95766654842.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_off0000bb3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB3F 10896 bytes
SHA-256: b9ec17ed7682506da8ccb0800a14a88dc2f67140039bc11378cf4555e95e9115
font_01_sfnt_off0000d437.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD437 15760 bytes
SHA-256: f63418964c0028c78f9674785a46f3d7e4556a79ed6a2311da5267997be7023f
font_02_sfnt_off0000fcce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCCE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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