Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c78612ae1fda9fe…

MALICIOUS

PDF

90.9 KB Created: 2021-08-12 21:58:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5a40fd83d9e4e53b3303d7bc7d569ce5 SHA-1: 3260815ad1861f92f26eeb8e0648771cfa0c0082 SHA-256: 8c78612ae1fda9fe348624def4f129175bd63812af6e2984a903ee4e4d48c807
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to files hosted on domains flagged as link farms or potentially compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The document body is heavily obfuscated and unreadable, providing no direct user-facing content, but the heuristic firings are sufficient to infer the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9721

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 http://sung1.com/upload/files/wewag.pdf In PDF document text
    • http://songhakbbq.com/uploads/files/58611036651.pdfIn PDF document text
    • http://aiskreunion.com/clients/b/b4/b417c2091670ce0b0d78f4b231aea02c/File/xalavofura.pdfIn PDF document text
    • https://nadrozmerne-sklo.cz/uploads/17341592421.pdfIn PDF document text
    • https://xn--b8qxb801j.tw/upload/files/81187084443.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ab5c25191d1---45952964172.pdfIn PDF document text
    • http://zafirkort.com/uploads/files/99252038386.pdfIn PDF document text
    • http://surrattsville69.com/clients/8/81/8122276c22396d7fa0996010cc369f50/File/piruwef.pdfIn PDF document text
    • http://burchiellati.com/file_fck/file/masagivi.pdfIn PDF document text
    • https://lochoanggia.com/upload/files/54502095136.pdfIn PDF document text
    • https://yellowstonewildlife.com/dulidofemaxinalixurejo.pdfIn PDF document text
    • https://sherwoodchamber.org/ckfinder/userfiles/files/5475105029.pdfIn PDF document text
    • http://dogable.de/userfiles/file/76722923958.pdfIn PDF document text
    • http://sun-eko.eu/files/file/7271429731.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/945405e451bac034ec304ce901355b48/44399645786.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/a533dd5f3ef68b509b35c0a98e0b2e08/26505576260.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160820718ec15a---21581333151.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/kenoz.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160b73ae8d407d---febasolinavizumojon.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/i4uu7s5it5ukjtu7d67pbeshh3/diforerezeki.pdfIn PDF document text
    • http://hciclerp.com/asset/uploads/files/pubedobufosilubobepib.pdfIn PDF document text
    • https://saam.vn/images/content/file/zudalaz.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/58993193164.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/90073109605.pdfIn PDF document text
    • http://historico.uts.edu.co/portal/app/ckfinder/userfiles/files/14520572513.pdfIn PDF document text
    • http://drive4smilesquebec.ca/clients/f/f5/f58105ca183540932673f5bf18e62671/File/panizelaxoloxiludu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=juego+de+serpientes+y+escaleras+para+colorearPDF 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_off0000e466.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE466 18928 bytes
SHA-256: 34f79814a9c122a95cb33c0cd49fe129a1caeb0a1a39bd660a8e11dc075ed609
font_01_sfnt_off0001153f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1153F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D50 16068 bytes
SHA-256: 6d636ebcb28a43c11a0b96216d988d0aaa25e428b847d4e039b2a2a6b6e27b6d
font_03_sfnt_off00014271.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14271 10896 bytes
SHA-256: e829d9537e5a1915a3c86178fab3d4a9888a54f82cbb5bccfbaf2e5d20cc04c4

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