Malicious PDF — malware analysis report

Static analysis result for SHA-256 e26f38cd2cde1aea…

MALICIOUS

PDF

96.2 KB Created: 2021-08-13 12:55:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e3a1d74e3b2a0e7a192c6e0a612728f2 SHA-1: b9e158687f01bdfb524854476ea0d089e3ef1944 SHA-256: e26f38cd2cde1aea1d544f2771b9b40713004ee96910cd95f8a3cac779a10418
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs, such as 'https://crewmak.ru/uplcv?utm_term=wow+english+grammar+book+class+8+pdf+download', are likely used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crewmak.ru/uplcv?utm_term=wow+english+grammar+book+class+8+pdf+download PDF link annotation
    • http://ymmicro.com/files/files/sirotijewagelorujarijubev.pdfIn PDF document text
    • http://domusanna.it/userfiles/files/pateriluxemekelega.pdfIn PDF document text
    • https://atraba-holding.com/userfiles/file/99076479744.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609670c374477---wubakamunonuwawemafi.pdfIn PDF document text
    • https://poganyvolgyi.hu/userfiles/file/wenosa.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/6burvvdvbcmlentader6j24g8o/zotubovuzedotepubume.pdfIn PDF document text
    • https://www.adilaltinsoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077b1f044587---pufetibitifanika.pdfIn PDF document text
    • http://gptools.net/userfiles/file/12822498745.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/80258385209.pdfIn PDF document text
    • http://climacom.eu/userfiles/files/kovotepebugi.pdfIn PDF document text
    • http://griby.biz/ckfinder/userfiles/files/wokenivixoruf.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/93c5c5928d0a66826a7e163ee95a11f6/bawelenetodivivut.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160943e248151b---mibovixuvupamu.pdfIn PDF document text
    • http://breakevenpoint.pl/uploads/editor/file/buwogopo.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088adcdd0fff---29411917254.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609e660565fa6---82915509479.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609a012335238---najolewemidejerobupebin.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0557bdb442---55686321112.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/tevukgqglk39bn2ievqojtir6q/luxanuwazolatiz.pdfIn PDF document text
    • http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/53243316622.pdfIn PDF document text
    • http://www.mediagrand.hu//data/editorfile/mesasenojatimojewabajebaw.pdfIn PDF document text
    • http://krajinar.cz/soubory/files/pewesenu.pdfIn PDF document text
    • http://voxel-avocats.fr/uploads/file/pajojidenijonumoxis.pdfIn PDF document text
    • https://hophamthaibinh.com/upload/files/tatefebifeno.pdfIn PDF document text
    • http://smsalumni1971.com/apadmin/uploads/userfiles/files/sewuwixunerujot.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_off000110dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000128ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128EF 17592 bytes
SHA-256: 00b07817417dc6724e2b2933a65bdf4bd95131778aded2dda0efe96d1b0e7c0c
font_02_sfnt_off000156fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156FB 11488 bytes
SHA-256: 407c97cbd004ca17becf5c268d01e7dd1b1ece0ca2f652dd97bcfbe27c4de87a

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