Malicious PDF — malware analysis report

Static analysis result for SHA-256 99166d55eb3b09fe…

MALICIOUS

PDF

83.0 KB Created: 2021-09-04 00:58:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 440b5febd1caf35966ffb980b2d6d92e SHA-1: bba4922cfd16b979919d0bc83156f270a41d8b18 SHA-256: 99166d55eb3b09fe860991daff40978f29f795abc58e230a88809407d7562b5f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document designed to redirect users to potentially harmful content.

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 https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/t4qh81gqcomu22t5bj5jnco1p4/falasipinisokagima.pdf In PDF document text
    • http://www.web-globus.de/ckfinder/userfiles/files/2160011265.pdfIn PDF document text
    • http://ok-poland.com/userfiles/file/zumokuvevo.pdfIn PDF document text
    • http://fantalife.nl/userfiles/file/36036027815.pdfIn PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077793c16820---senasametukazeriji.pdfIn PDF document text
    • http://studiovalentini.eu/userfiles/files/pijebilimalukexopi.pdfIn PDF document text
    • https://betenrealestate.com/sites/default/files/file/satanopitapipuviv.pdfIn PDF document text
    • https://coolingrealestate.com/your-home-cleaner/FCKuploads/file/tidegorutom.pdfIn PDF document text
    • https://aplusadvance.com/naver_editor/data/file/kupopopugamuvokesupitoxu.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa9acaf066---ferizirefujisoporelotigu.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607a733b00d57---2876714238.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad0ec8b2ec3---seboxusiwinobugireje.pdfIn PDF document text
    • http://donleroy.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/30557016310.pdfIn PDF document text
    • http://bjallstar.com/upload/file/podej.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/0702333e288dbd82ce18485e8abd9511/xemutetesixobubafe.pdfIn PDF document text
    • https://workinhotel.com/upload/fckfile/54438206149.pdfIn PDF document text
    • http://www.wiz-fac.com/uploadImg/file/wisamavomodenuj.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16078e73290c37---zuluzabaretugipipevuref.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/febc67186ceb2c9f7980bbed6e785c01/tisusinu.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16082186d879bf---8086275662.pdfIn PDF document text
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/892ac8ded280ee256cf999323d3930ac/vibapazaniwu.pdfIn PDF document text
    • http://www.nagsa.es/ckfinder/userfiles/files/wurinadanutugakike.pdfIn PDF document text
    • https://fontaine-eva.fr/userfiles/files/19573184102.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=thomas+edison+biografia+pdfPDF 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_off0000db90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB90 10904 bytes
SHA-256: 1db9af32ba65128493137b295d10ea3874ede7f3821dd7c1a034eeea1f594c52
font_01_sfnt_off0000f41f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF41F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C31 19816 bytes
SHA-256: 4a58510ecec1fdabdf8e6365c2ca99eb0f286a09f6786105deda46dd030545cc

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