Malicious PDF — malware analysis report

Static analysis result for SHA-256 c70dc8663e32d393…

MALICIOUS

PDF

88.2 KB Created: 2021-09-13 01:07:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0e9ee66a7aad29993380a3eb2746c19c SHA-1: 42bfa86f7dca482a5bda4faa8a3ecb05549b8bf4 SHA-256: c70dc8663e32d3939a2f81070e908286be9f304cc72589854824c2db8b63bc6c
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or SEO poisoning attempt. The embedded URLs, while some are marked benign, contribute to the overall pattern of directing users to potentially malicious or manipulated content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/akj3h4rd4tqpr9qh8trjf3usl0/24078539995.pdf In PDF document text
    • https://psiakocky-potisk.cz/webpagebuilder/ckfinder/userfiles/files/wekup.pdfIn PDF document text
    • http://poledance-chrudim.cz/files/file/37777001229.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/e7e790c41edd7fa72beecb8ae8020b67/zulobexidota.pdfIn PDF document text
    • https://menokatea.in/ckfinder/userfiles/files/55381105951.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130cc109b095---86686670210.pdfIn PDF document text
    • https://miet.hu/kepek/bakobes.pdfIn PDF document text
    • https://chaletsuenodesol.de/files/xuxulosuxaxuzirefexojeg.pdfIn PDF document text
    • http://maulich.vn/attachment/files/zixoz.pdfIn PDF document text
    • http://fatfailogistics.com/fckeditor/files/file/65850058463.pdfIn PDF document text
    • https://www.tocbirsen.org.tr/ckfinder/userfiles/files/boworidanetitotafibi.pdfIn PDF document text
    • https://ntc-container.com/upload/files/96370174836.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/f06a027eb68a2bdaaa90649026f420ea/84307115604.pdfIn PDF document text
    • https://asharfilalkulfi.com/ckfinder/userfiles/files/xugumovogo.pdfIn PDF document text
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wigovuwolopubarimaxujom.pdfIn PDF document text
    • https://fleschimmo.lu/userfiles/files/sunifozategebexobomi.pdfIn PDF document text
    • http://bsinteriordesigner.com/userfiles/files/46506886062.pdfIn PDF document text
    • https://www.multilandtours.com/assets/ckfinder/userfiles/files/83818491346.pdfIn PDF document text
    • https://bda.ch/ckfinder/userfiles/files/kikutet.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16133a913d8bb3---23245488142.pdfIn PDF document text
    • http://tygodnikzuzlowy.pl/ckfinder/userfiles/files/72372283005.pdfIn PDF document text
    • http://miyisz.com/mingyi/images/userfiles/file/84664151687.pdfIn PDF document text
    • https://bushregenerators.net/userfiles/files/51489099954.pdfIn PDF document text
    • http://webbyshoe.com/fckeditor/userfiles/file/49768600810.pdfIn PDF document text
    • https://itandem.net/ckfinder/userfiles/files/lijuxakekasozuzibati.pdfIn PDF document text
    • http://asremajazi.com/uploads/files/69556220071.pdfIn PDF document text
    • http://showplus.ae/userfiles/files/dexil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=cinema+apk+for+android+boxPDF 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_off0000f13e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF13E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010955.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10955 10712 bytes
SHA-256: d5932c7da698c3547fd755c16605d4ef8df502c8847f888f6a228d78ba503bd9
font_02_sfnt_off000121a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121A4 19088 bytes
SHA-256: 55101e404b4766b7c342cd91fd883a53ad5674aa68f10143371819ea72ab161b