Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cccf97fab3729e1…

MALICIOUS

PDF

82.1 KB Created: 2021-09-01 10:34:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 85f9d0ba0bb48851aaf259d763ebf2c5 SHA-1: 100b89ceca47c90a6d54f3f75eb07a2e3dd42f61 SHA-256: 5cccf97fab3729e10b6b021469620f59cd25c77e14d432121bfb5129737a1c01
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to domains identified as compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to phishing sites or download further malware. The file's structure and link farm nature suggest it's designed to obscure the true destination and evade basic detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://www.latentoac.com/portal/wp-content/plugins/super-forms/uploads/php/files/pmmvqldpjup1pmv9kdir904sq6/surusosujavunijita.pdf In PDF document text
    • http://dobre-jaja.com/Upload/file/86123992888.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/xomatolibapor.pdfIn PDF document text
    • http://sattamatkapatti.com/userfiles/file/4305261148.pdfIn PDF document text
    • https://lukili.ch/UserFiles/files/pozadejexavegixi.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c5eaadbe40c---pesekiso.pdfIn PDF document text
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/16258264088.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bd44c3d7a6---vozosi.pdfIn PDF document text
    • http://utuin.net/files/fckeditor/file/vojuli.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16082bdd85b4ec---poxowa.pdfIn PDF document text
    • http://tongkhomica.com/upload/files/sizagopokupopudodoziv.pdfIn PDF document text
    • http://rsst77.ru/upload/files/biremawiwefiwag.pdfIn PDF document text
    • https://quatcongnghieput.com/uploads/files/mokelemomazix.pdfIn PDF document text
    • http://lovemyskindayspa.com/clients/d/d9/d99ed7cf7cbac978b7326c22a81d1608/File/lutuporixilurebos.pdfIn PDF document text
    • http://moderncarrent.com/user_img/files/mamuvevesevadekujureniti.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160bc8f873dd42---52750793398.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa86c82166a---32780299115.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/dekaronixukew.pdfIn PDF document text
    • http://phoiinnhiet.com/images/uploads/files/39979323243.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16075f61fa8aa7---61974731223.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/2e8c3321cd6173572810c4a8e7723db4/koderajurare.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611455e73cd82---xofuwifutewilumiwej.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/3b18e85a96e6e3614308c4fa02412683/1852169503.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=one+kb+is+equal+to+how+many+mbPDF 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_off0000da70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f282.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF282 17924 bytes
SHA-256: 7cac2c6c9a9a6aa4c51e1a4bf4eabdae7f4e604c5f4292631bfd4996d08ef4ca
font_02_sfnt_off0001214e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1214E 10976 bytes
SHA-256: f8dee60106ccbe5501bf64ce8734679d5e72f34e2478612ec3fe2c39c7804fd0

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