Malicious PDF — malware analysis report

Static analysis result for SHA-256 37b2ed48f7025acf…

MALICIOUS

PDF

81.0 KB Created: 2021-07-02 22:27:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 3a880435702ed291cd36f10d67ba2f81 SHA-1: 952f475d1ccdd2f9b60fe282fde0d2d89dea7145 SHA-256: 37b2ed48f7025acfacfcf08b5c646b53b4ae468df0537f751d60bbb0ab9b8315
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm with numerous URLs pointing to compromised CMS upload directories, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites. No scripts were extracted, but the structure and URL patterns are indicative of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb82ed2e08---5955969712.pdf In PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/98d96601bb4913959f046d1fcaccf80b/83472093554.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/68405019909afd65282ed68af44db5fb/vitenamuwimanobas.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c285a86fe9---89205146731.pdfIn PDF document text
    • https://zzhqhi.com/d/files/48491957171.pdfIn PDF document text
    • https://xn--fct8ml6mwue.tw/uploads/files/zixibuxefa.pdfIn PDF document text
    • http://indovinandoilmondo.it/themes/userfiles//files/37626788380.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/47869529348.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a95f6f00346---rezopewor.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/suresipixobuka.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc49d65b7a---75805623345.pdfIn PDF document text
    • https://puppometalli.eu/file/30874390495.pdfIn PDF document text
    • https://bczenekar.hu/files/file/71973173544.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6e6c527fde---59497590974.pdfIn PDF document text
    • http://ecogestval.com/userfiles/file/61598963380.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160827b37d7914---30731796913.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/oq9ath8i2anjcsgrfnmkq5n8d8/35087194822.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/u281i6uceg7qf7s7nqrb94hdrq/ximewotasapike.pdfIn PDF document text
    • https://afra24.com/basefile/afra24/files/30838660280.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/6575219466.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/05c88a60b4c9b08ee01c11f4295a0a72/84001286267.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/ffea24cb1b6bfc1530b4d266e915696e/kazixirufezid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=hail+mary+2pac+mp3+download+freePDF 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_off0000d336.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD336 10996 bytes
SHA-256: 57868abf110a7e7f6b6599abb120eec6c02855bc49290c0bf206da9a5aa6ed2f
font_01_sfnt_off0000eccb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECCB 19804 bytes
SHA-256: 59c67e2bf48324f67e624f1a2c86bdff98b93773668eb986524bce9525c42410
font_02_sfnt_off00011ed3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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