Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5629e586a7aa6d6…

MALICIOUS

PDF

81.1 KB Created: 2021-09-18 23:51:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5df75dd11d1cec7f7555e56f4ab03357 SHA-1: 9f031ee312360ac8a623bb4af5f4a64acd191d06 SHA-256: b5629e586a7aa6d643b15406dbedbfd1458d7450fa1a484cce531bd22ab0323e
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which appear to be hosted on compromised WordPress sites or disposable domains. This structure strongly suggests a link farm designed to redirect users to malicious content, likely phishing pages or malware download sites. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://cructi.ru/uplcv?utm_term=full+screen+hotkey+chrome PDF link annotation
    • http://sutipatika.hu/userfiles/files/lenixixoweli.pdfIn PDF document text
    • https://brakos.it/file/28128576157.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/59bff61d0ccb9ffe44d903fdc1ce3db2/54568077890.pdfIn PDF document text
    • http://samurairamenbar.com/uploads/files/tezajokezaxoregutunerinil.pdfIn PDF document text
    • https://underworldgear.com/admin/images/fckImg/file/tizoxiberoxuzuko.pdfIn PDF document text
    • https://usgcambodia.com/userfiles/file/30716109220.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/d5449fb274feddd9ee3f6b97c306348b/rodebodunujisinewiviziso.pdfIn PDF document text
    • https://elsadaulte.com/ckfinder/userfiles/files/44394555018.pdfIn PDF document text
    • http://dj-maily.com/uploads/pages/files/wolalunupozosebotipibasi.pdfIn PDF document text
    • https://koltoztetes-szallitas-lomtalanitas.excore.hu/ckfinder/userfiles/files/lipubisazuriledaj.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/pabuxivuwaton.pdfIn PDF document text
    • http://mobitransjogja.com/files/nefiv.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/21810741809.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161381e146ceff---nagexoduro.pdfIn PDF document text
    • https://podgoricki-klub.me/userfiles/file/72244230240.pdfIn PDF document text
    • http://associatedreclaimed.reclaimedoils.com/userfiles/files/36813928946.pdfIn PDF document text
    • http://lumieretvie.com/userfiles/file/71875898392.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021091602571773499.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135c5926844c---19412709174.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/tulemimanizigezigir.pdfIn PDF document text
    • http://vinhthuan.com/upload/files/60796537191.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_off0000d740.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD740 18424 bytes
SHA-256: 15e896acf2b93c94745b1de8a2d59077d3c791e1fe019c66625b1beef2258a11
font_01_sfnt_off000107b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011fc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC9 10524 bytes
SHA-256: a19da4819e59bf97156eff922f76f88480b68037a04d91257f9612d8d1a8e079