Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4b8560057552bd2…

MALICIOUS

PDF

75.6 KB Created: 2021-07-08 00:03:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: f75e0cda07cd58438feb370fed370d0e SHA-1: 4a9691c605d7cb407d2271d1fd58ee4c4d45ed75 SHA-256: f4b8560057552bd2b07f2d8695b98797d972c945a6cde3a4b3977d204faf8b06
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it contains a link farm pointing to compromised WordPress uploads and other disposable hosting, suggesting a phishing or malware distribution lure. No scripts were extracted, but the PDF structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://skyzoan.com/cake/beta/userfiles/file/farobelilaloramojeda.pdf In PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/62eca881971b3657ab49f72edb48f26f/90893913684.pdfIn PDF document text
    • http://inglewood1968.com/clients/68690/File/20074017611.pdfIn PDF document text
    • http://thaimassageboy.com/ckfinder/userfiles/files/992794735.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/17070c1ed63210ae49206a190f44f303/95564798207.pdfIn PDF document text
    • http://hoangle.vn/uploads/userfiles/file/8448263713.pdfIn PDF document text
    • http://sriagasthiyarastro.com/FCKeditor/userfiles/file/77877615313.pdfIn PDF document text
    • https://airbays.com/userfiles/file/nujitixeguweboluvo.pdfIn PDF document text
    • https://likeevent.it/writable/public/userfiles/file/21777192344.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606f77debf88f---18635465960.pdfIn PDF document text
    • http://alkanboya.com/files/file///mulozusajasobopazute.pdfIn PDF document text
    • http://builderall.info/userfiles/file/vamodifutomupufagopon.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/15963211824.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/78155875590.pdfIn PDF document text
    • https://weyergans-hcc.lv/userfiles/file/97935077053.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16072740040d8b---36179273608.pdfIn PDF document text
    • http://sehs67.com/clients/e/e0/e078d4d0076166a7bb489ca3b3a583ab/File/guxilanenunabizabipigo.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/079a5f71656519902508b83214250b15/42700815918.pdfIn PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/xadave.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7fde820a0a---bukiludezavukekab.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/b63dc20149a07ca70e91622c063b233d/poguzogufawinoramob.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/16079507b50a79---zotiwitub.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/59cb610bf13cfa59eecd6521bdc5df1f/59151374083.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=when+does+the+sunrise+todayPDF 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_off0000c52d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC52D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD44 10504 bytes
SHA-256: fbb5ffa5c72c03119a6edafa5246f2bb3d4c773586183fcf621bef05e28e4d1b
font_02_sfnt_off0000f526.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF526 16968 bytes
SHA-256: f0fe3ce3594477de07eed1c537bab70e540c689ad804f2c004aa86b87b2f9ada

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