Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ec72fb09cc83ac7…

MALICIOUS

PDF

82.0 KB Created: 2021-09-04 09:13:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 23f657a4320010bd4aa793481766aff5 SHA-1: 035639961c85f1ac0d75f42bb2bb1ebe0ac3b03b SHA-256: 5ec72fb09cc83ac7b5f56f2b925607313b872dca5e5296f082b2896290323701
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 or disposable domains, as indicated by the 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links. The document body is heavily obfuscated and unreadable, providing no direct content-based clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://urjabatteries.in/userfiles/file/60625820774.pdf In PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bd9c0eae2e4---13698736025.pdfIn PDF document text
    • http://faceconnects.com/ci/userfiles/files/15554784065.pdfIn PDF document text
    • https://3drm.bg/uploads/pictures/files/segasibitawudune.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a6195ac6d4b---niwudir.pdfIn PDF document text
    • https://jamurgoreng.net/contents//files/woxamebifusadebosir.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/977b040b1e90e62b431277fcf62ca60e/53963250178.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/160a7deef64be6---27395263346.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/161081ad9416d7---48909580716.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/34189081180.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/ca1931b3639c2847681f7ad9b3697bc6/dusifufokobenevonev.pdfIn PDF document text
    • https://bookatowncar.com/userfiles/file/80261229703.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/5ccd786aba940c8b9ce7055b31e62f97/31664891865.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/sufaxukimovofogipif.pdfIn PDF document text
    • https://aynadakikemalizm.com/resimler/files/kekogex.pdfIn PDF document text
    • http://0048.pl/48files/file/84649590933.pdfIn PDF document text
    • https://yssnewlessons.org/UserFilesTwo/file/7368212613.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160988cfe0fc06---lilosexamezodalunewi.pdfIn PDF document text
    • http://residencecarlofelice.com/userfiles/files/pigagarofepavakiji.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc5388db0b.pdfIn PDF document text
    • http://pokewaveanaheim.com/uploads/files/nimoxizege.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/032blfusi3b7gosnuud98btlka/xobuzevopipuxokekudufobel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=classical+realism+in+international+relations+pdfPDF 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_off0000dd24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD24 10812 bytes
SHA-256: b55c86b3d6d6b87ea446ea90971f22639dd1a2f311b55f74fc403c2f4efdf2be
font_01_sfnt_off0000f60c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF60C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E1E 17404 bytes
SHA-256: 4c1e158105dc872ba9b84fa2773278bc24657c6a205113be244825f9641d5781

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