Malicious PDF — malware analysis report

Static analysis result for SHA-256 55b1ac757ce3eba5…

MALICIOUS

PDF

81.3 KB Created: 2021-09-13 05:05:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b1fabe573e7214d5837c82f8effe8853 SHA-1: 74fbd4b4795dae3914d8e6e5f9f3ec4edac0caf6 SHA-256: 55b1ac757ce3eba51d1122642fc1cd0bf426fc6d29dffcea96a6d921d363eaf1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent. Although no scripts were explicitly extracted, the nature of the URLs and the 'link farm' heuristics point towards a phishing or malware distribution attack pattern, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://irlanc.ru/uplcv?utm_term=robux+websites+that+work PDF link annotation
    • https://lorus.rs/files/sowen.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/2ds70iqe3jkh2cdr1q8odt1qba/mabewube.pdfIn PDF document text
    • http://homesunshinepharma.com/upload/files/linenupisa.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613115062add2---kosavimubufidisi.pdfIn PDF document text
    • http://residenceraffaellotorino.com/userfiles/files/86027857389.pdfIn PDF document text
    • https://yunglin.com/uploadpic/files/45113081564.pdfIn PDF document text
    • http://sictombbi.fr/ckfinder/userfiles/files/palomazilufugomufogin.pdfIn PDF document text
    • https://standsimulator.com/ckfinder/userfiles/files/bazugedafejideruginuzap.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/d22ddfe510f7d3722271f2799c5e2435/5422202698.pdfIn PDF document text
    • http://cdwy028.com/uploadfile/file/20210902015209.pdfIn PDF document text
    • http://faurau.com/luodan/images/userfiles/file/giwibagipemetedozefen.pdfIn PDF document text
    • http://thanglong.vn-greenenergy.com/ckfinder/userfiles/files/jokanezutibegikazafutorit.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/e6879ac43f15ebfc228f2edd6a81a740/sedututixotef.pdfIn PDF document text
    • http://kleinschadenexpert.de/userfiles/file/96496312569.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/a664d71decbb1dcad75f0472b320a83c/dufum.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1c2de1e11---18385670215.pdfIn PDF document text
    • https://nguoixunghekiev.vn/userfiles/file/zadetep.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/5mbun5jmm5373mpjv6654vc2eh/67330916950.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/161355858a85a3---91971549777.pdfIn PDF document text
    • http://erh-hu.com/userfiles/file/27180069696.pdfIn PDF document text
    • https://sanruouvang.net/images/uploaded/file/83419471897.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613c341bb38a4---puretenupiwas.pdfIn PDF document text
    • http://yieldpharm.com/upload/files/13101809640.pdfIn PDF document text
    • https://piti.leaddeehub.com/userfiles/files/54990777142.pdfIn PDF document text
    • http://solartgaleria.hu/images/file/63091807024.pdfIn PDF document text
    • http://rocb-ap.org/file_media/file_image/file/63807237809.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_off0000db1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f331.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF331 10620 bytes
SHA-256: 1c0cbb6353e9856547f5bdda8d428c82eb2162a3231290132ba2cb38ca7549b5
font_02_sfnt_off00010bc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC3 16896 bytes
SHA-256: 98466ba33b2da532e3b7c096ddd7e81288dcb5c09bd545d74c13d419397349fa

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