Malicious PDF — malware analysis report

Static analysis result for SHA-256 3931eb802cc21545…

MALICIOUS

PDF

89.9 KB Created: 2021-06-30 22:43:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: ed1af3ab9e83012f945030ccbe662687 SHA-1: ccf61787a0b73e0052ef26fddbdf5e70f8e3993a SHA-256: 3931eb802cc2154599109414fd3dff5a18e1f37d41abe3e3cb31e05d945af4c1
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple external links, including one to a suspicious domain and others hosted on compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the embedded URLs suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://synerhu.ru/uplcv?utm_term=200+most+commonly+misspelled+words PDF link annotation
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/1942d08c61d9dca97c3289c85a78b79d/nemejuzurebowinexikubata.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1a1edc45f---9624986919.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/3f99cn3ggs0pvapqjjpl12f0i9/penumedodudifo.pdfIn PDF document text
    • http://smeeing.com/userfiles/files/lefabizidupukiwojosasizal.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072cbe00797f---jojelajiguzutigezogajono.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/d6a759c49be72f428dc12f83b4a190ee/67684748426.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/79340953007.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/zonapezap.pdfIn PDF document text
    • http://artistalexanderkanevskyroyalshakespeareglobetheatrelondon.com/clientMedia/file/ruwop.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4e17e8e900---68040190145.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/zeruwofemo.pdfIn PDF document text
    • https://stdtekstil.com/upload/ckfinder/files/33749456611.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/sf679789ujbfhlp56aio2en5i4/tumas.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/vizapunanukagamu.pdfIn PDF document text
    • http://vinmexindia.com/uploads/kiwizaxuwux.pdfIn PDF document text
    • http://ekotronic.eu/files/file/17441440924.pdfIn PDF document text
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/a70d7d90debe42d18001ac31fb6f85f5/lefuperipavekesu.pdfIn PDF document text
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160829735891d9---82463385121.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/036bbc3184080c702badc713fa1e3d10/71550354796.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/ziniw.pdfIn PDF document text
    • http://terminsk.by/pics/files/nigabosofu.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/76979764850.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/ftns7vdcoboemh3vg8nvvum1um/kulafej.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16082fd662ddc7---zijakuna.pdfIn PDF document text
    • https://diaochue.vn/userfiles/file/buviworovumek.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/09pd0ujicbfgm8n5k32gmua7v3/netijowow.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_off0000fdbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDBD 16612 bytes
SHA-256: 90caa4ee681fde6159a7701acf3629099d8b828db955bfe7edf88e0904357a84
font_01_sfnt_off000128e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000140fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140FD 10860 bytes
SHA-256: a9ea23e8f80df976b0869e128b2d8d87776bd1d7ec8cdbb07cc3d1294767e6f6

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