Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ea7efd435821a66…

MALICIOUS

PDF

111.3 KB Created: 2021-07-29 19:19:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: fba5b7742ff3fedd3cd99d04cbbc20a1 SHA-1: 2bdca0672bfdcb37f8002ade6e2e14a3558ef278 SHA-256: 2ea7efd435821a66567d9f2ff77199199279a262c2caec2b81042f06939e804f
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent. The presence of multiple external URIs and compromised CMS upload links reinforces the nature of this attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9890

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://ketchas.ru/uplcv?utm_term=what+does+rouleaux+formation+mean PDF link annotation
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/1f5f7do9gtvetenbb2ckuqmvbs/salaxorefosume.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1b5fe0053---pukuvidozurebupekukefukos.pdfIn PDF document text
    • http://centronegozi.com/public/tiwamegowenip.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/adonjmnv8me7i8itp0tkqptrt4/56202326603.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/00cac33dd567f7154dcb4f74f34c6d76/tilulexasarezubulutoriton.pdfIn PDF document text
    • http://ural-kip.ru/admin/ckfinder/userfiles/files/16227234300.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/19a9525f213c9b771875777414b3c04c/pelusoti.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16077ca343b1eb---16797893911.pdfIn PDF document text
    • http://dilimkebab.com/userfiles/file/64871945288.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/2d2ae4a217da1ccc471e2e2158cf81a4/xaxew.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c557da4e3---pijesegunegeno.pdfIn PDF document text
    • http://cn-biyoute.com/d/files/45615479277.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd446d498e---74424543353.pdfIn PDF document text
    • http://onestep-tokyo.com/userfiles/file/39572019481.pdfIn PDF document text
    • http://hk-dcc.com/wp-content/plugins/super-forms/uploads/php/files/8ie08antsigspmfk5h3qad7sdg/javimikusigefuvomipegab.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071dd2e806f5---40863765094.pdfIn PDF document text
    • http://stonebriarranch.com/clients/876969/File/pidok.pdfIn PDF document text
    • http://charontrade.hu/data/file/tanafepebetimuzopiduk.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/8e2f19a1f5f256ad3acf216c31571951/kawuj.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608d661ba681e---30370176151.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160949d67921d8---42948907107.pdfIn PDF document text
    • https://papiratisk.cz/soubory/nanoloxozitatozuvo.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/manuwuzunogub.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607453c46a868---xonevunefadonomujeg.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011130.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11130 22228 bytes
SHA-256: 6f2f9f1b5f3eacf4c89d65c5ba1f308cdf55e5f30813448c7dbdfd5656530ab7
font_01_sfnt_off00014a1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A1F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016230.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16230 16684 bytes
SHA-256: adbdcdd438309e8fabe171fc2c3185d7ca04f2fb0da29c75d9eac33fbdb9550c
font_03_sfnt_off000179c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x179C8 7828 bytes
SHA-256: 9a11624de7f61d5523b3c1148e82fd4413234534b511727fa0bda3f9e54c22af
font_04_sfnt_off00019309.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19309 10816 bytes
SHA-256: d8643bcefe57144a509da6f9bcf4f962ff59da67fb9235ffdd9610b15442b509

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