Malicious PDF — malware analysis report

Static analysis result for SHA-256 5839e50ef5d9589a…

MALICIOUS

PDF

71.2 KB Created: 2021-09-18 23:08:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 66c13eb905e9aad67735bdebab42ee72 SHA-1: c9f4fcc2c5280970b0d0b5114634ac620cc984c3 SHA-256: 5839e50ef5d9589a18a84054b4c2eaf427be79f04c495e600cc5fe23f9f578b5
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 compromised CMS upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, but the link farm structure is a common tactic for directing users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://accu-split.com/userfiles/files/rarujukamositidedomud.pdf In PDF document text
    • http://ainut.fi/userfiles/file/podilesinekaganododajipu.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16137abb395b20---3046393808.pdfIn PDF document text
    • http://ylphs.com/ckfinder/userfiles/files/88921067767.pdfIn PDF document text
    • http://sanchariglobal.com/userfiles/file/maxatexifa.pdfIn PDF document text
    • http://svazekobciorlice.cz/userfiles/file/fejijubupawata.pdfIn PDF document text
    • http://cbcom.fr/ressource/site-image/files/12522593444.pdfIn PDF document text
    • https://oykufestivali.com/ckfinder/userfiles/files/91942512195.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5225dd931---15212630546.pdfIn PDF document text
    • https://equipelec.fr/ckfinder/userfiles/files/37504767740.pdfIn PDF document text
    • http://thechelseaff.com/user_uploads/files/gumonedam.pdfIn PDF document text
    • https://copacndg.com/images/uploads/files/gedofilelebuselobelimu.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130a794c0fc7---rexogipipeluweru.pdfIn PDF document text
    • http://theartofdesign.nl/ckfinder/userfiles/files/35712532259.pdfIn PDF document text
    • http://mintaialuminum.com/d/files/41260602176.pdfIn PDF document text
    • http://e5tbr.alruaa.com/ckeditor-ckfinder-integration/uploads/files/giradetukinomogezenopobi.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134cac6511a1---daxugek.pdfIn PDF document text
    • https://hopadive.cz/ckfinder/userfiles/files/sizasoxoxatageli.pdfIn PDF document text
    • https://1000families.eu/userfiles/file/pewuxomele.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/86113179566.pdfIn PDF document text
    • http://vivaibonomo.it/userfiles/files/jureguropawi.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16141360a63521---wavoj.pdfIn PDF document text
    • http://brenderup.ro/mm/file/sorumagupibasun.pdfIn PDF document text
    • https://www.ewdel.cz/ckfinder/userfiles/files/rijuje.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/45572353108.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=season+5+of+bnhaPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b613.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB613 16416 bytes
SHA-256: b0f0ffd54d8cad24fbb159a098bbb2b7345e2a7035ff7ba9f4ec12f766bd337c
font_01_sfnt_off0000e078.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE078 10324 bytes
SHA-256: 74e41e6c53404571d3b9b082cab478a1d7905486298b85d1d541463bf0491def
font_02_sfnt_off0000f7b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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