Malicious PDF — malware analysis report

Static analysis result for SHA-256 252939dc38a914f0…

MALICIOUS

PDF

88.3 KB Created: 2021-09-21 20:38:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c086fc3b8ccd675f505eedabaa669344 SHA-1: 462488366c98e7de56295c2b5cdeba9d4ca221e9 SHA-256: 252939dc38a914f05c24f948ba91d84ba4b80fe72073be3066c0f07edd1c72e9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting vulnerabilities or redirecting users to malicious sites. Multiple heuristics indicate the PDF is part of a link farm, with many URLs pointing to compromised or disposable hosting, suggesting an attempt to distribute phishing content or malware. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://philabc.ru/uplcv?utm_term=data+preparation+for+machine+learning+pdf PDF link annotation
    • https://szallas-karpatalja.com/upload/85556519264.pdfIn PDF document text
    • http://hamlineparkplaza.com/assets/amund/ckfinder/userfiles/files/jexifonabofu.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/161359292a091d---54580160937.pdfIn PDF document text
    • https://shop-ecobati.com/medias/upload/files/pefisowovivaxowuz.pdfIn PDF document text
    • http://spharma.ua/files/file/76878799340.pdfIn PDF document text
    • https://tavcam.com/upload/ckfinder/files/55298127392.pdfIn PDF document text
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/3700611106.pdfIn PDF document text
    • https://nexapos.com/upload/files/lofemafuf.pdfIn PDF document text
    • http://sevinctekstil.com/resimler/files/37068777480.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc3166d235---2906924358.pdfIn PDF document text
    • http://kaies.cn/upfiles/file/limarazafujaz.pdfIn PDF document text
    • https://letstravelforacause.com/miet/assets/files/sekanafuded.pdfIn PDF document text
    • https://aokman-drive.com/d/files/90092308128.pdfIn PDF document text
    • http://athaj2.specialty-match.com/upload/files/90296633086.pdfIn PDF document text
    • http://gymostrov.org/gymostrov/userfiles/file/gifuxodesaxoxigukedo.pdfIn PDF document text
    • https://unicorn.mn/js/ckfinder/userfiles/files/rukevatikivefurezivi.pdfIn PDF document text
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/27685474063.pdfIn PDF document text
    • http://aquarium-kochi.com/app/webroot/ckfinder/userfiles/files/xovixoluloduvul.pdfIn PDF document text
    • http://marketingnews.fr/images/file/36603771811.pdfIn PDF document text
    • http://chaitraglaze.com/uploads/63864232800.pdfIn PDF document text
    • http://danguykhoidoanhnghiephp.vn/Upload/files/vutiken.pdfIn PDF document text
    • http://sinice-rasy.cz/files/file/zilil.pdfIn PDF document text
    • http://www.terresdescaraibes.fr/file/jolilidewanibu.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16133cd8ee698a---857888635.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_off0000f3f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C0A 18056 bytes
SHA-256: af26bbfe8196adb95e03c254f9d92c52e0fbd6a226a2604bfc9d71577fedb176
font_02_sfnt_off00013b16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B16 10900 bytes
SHA-256: 3c3abc08eade57a0c442c915255223ac6e5d79f90b796495d78f51cc4cf2a375

Open this report in the interactive analyzer, or submit your own file for analysis.