Malicious PDF — malware analysis report

Static analysis result for SHA-256 51d7ec913f0fb155…

MALICIOUS

PDF

76.7 KB Created: 2021-09-08 09:10:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 27400898b0fee00bfc9b6331169bc8f4 SHA-1: 76fcbf394dfb788be1cfc332083f4c2c198a97a9 SHA-256: 51d7ec913f0fb15521693a192989970465076d99785671fd54f395005ff60a5a
156 Risk Score

Malware Insights

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

The sample is a PDF document identified as malicious by ML classifiers and ClamAV. It contains a link farm pointing to numerous domains, many of which appear to be compromised WordPress sites or disposable hosting, suggesting an attempt to distribute phishing content or malware. The presence of multiple external URIs and link farm heuristics indicates a deliberate effort to redirect users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://catamma.ru/uplcv?utm_term=mega+450+delay+box+manual PDF link annotation
    • https://landbar.com/upload/files/gixilumexurulisawigetole.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe308a0a0f---55690509530.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/jejanoritobu.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de9eef8a405---fadubotipelagifijopanome.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/46246673443.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/4gf2fqt09s827d73h2oiovi9o0/zewamurusifu.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/bokupilevo.pdfIn PDF document text
    • http://irisapp.cn/uploadfiles/fckeditor/20210808/file/16283813886813.pdfIn PDF document text
    • http://hftyby.com/upload_fck/file/2021-9-7/20210907050923687153.pdfIn PDF document text
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/0586c410480743a2a8d4ff2939262d1c/parop.pdfIn PDF document text
    • https://careoncall.in/userfiles/files/24158166989.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607710b38627c---81364437923.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079a4c79e505---89110785795.pdfIn PDF document text
    • http://podlahypilat.cz/admin/file/menaxinemijidedojoro.pdfIn PDF document text
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/48aba796261aaaf7d55a46ad249a62af/tevojozapalizajetutowa.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/8c7aa9ea26df31143ac78d49e6b9773b/90337815052.pdfIn PDF document text
    • http://tizianaiberti.it/userfiles/files/talitekazebifatiludugu.pdfIn PDF document text
    • http://holmeslawfirm-iowa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/75966025168.pdfIn PDF document text
    • http://www.s-prom.si/fileupload/file/58515486693.pdfIn PDF document text
    • http://emanuelarombiarchitetto.eu/userfiles/files/54315068144.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/mulunukizolaf.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c3365e6a516---89701944275.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099a1bb95b2e---sukeb.pdfIn PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/64782699850.pdfIn PDF document text
    • http://ccsl.asia/files/17728638527.pdfIn PDF document text
    • http://remont-etalon.ru/upload/files/11943951673.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/0f10dr06269mlinag74c342utb/23240779187.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_off0000c69c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC69C 10916 bytes
SHA-256: 44dcb076a9c0cac81053350557b3cd7dd393e48d15587c7a5e76a751721b4a32
font_01_sfnt_off0000dfc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC0 17680 bytes
SHA-256: 2aad912cf19df711b6f2fdb7d748d61d2dae9df12eca78a7385c9acf0ecbb9f3
font_02_sfnt_off00010d67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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