Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fad431647b64581…

MALICIOUS

PDF

87.2 KB Created: 2021-09-05 21:53:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1136ac9a3366ddc3baf37371de52ca72 SHA-1: a3587c9afb892b135cc33bcbe3278cf60949ac5a SHA-256: 5fad431647b6458122d800e6c310025f99990922fcbdb5abd49d542bc07146ad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm. The presence of external URIs and the overall structure indicate an attempt to redirect users to potentially harmful content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://wastran.ru/uplcv?utm_term=psychsim+5+worksheets+answer+key PDF link annotation
    • http://yuc-fac.com/uploadfiles/20210715120148.pdfIn PDF document text
    • https://bestwaynepaltrek.com/ckfinder/userfiles/files/59172764230.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/1c09bb52605b4c271d77a5ec0d469330/94414243838.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/16087e172ca187---67634428805.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/pkahvfngginadl0mtsoo6rq010/43695981348.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/8717ia7k3q85n1pn60d6p7biuc/wovakawaribog.pdfIn PDF document text
    • http://navigator-33.ru/media/file/xemegufizapoga.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160795ae5f15ad---tufife.pdfIn PDF document text
    • http://naturabliskociebie.pl/userfiles/file/81566534028.pdfIn PDF document text
    • http://thuonghieutoancau.vn/uploads/files/8117886561.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/kexarewajufimosukik.pdfIn PDF document text
    • http://bukharaatlanta.com/sites/default/files/file/29770956301.pdfIn PDF document text
    • http://grupopiscis.com/upload/files/35957573604.pdfIn PDF document text
    • http://tasarimak.net/ckfinder/userfiles/files/94781317385.pdfIn PDF document text
    • https://soechi.com/userfiles/file/14848809571.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd51530e8c---mumeporuwujuraro.pdfIn PDF document text
    • https://banghenails.com/upload/file/4677108818.pdfIn PDF document text
    • https://batikatravels.com/userfiles/file/12492809162.pdfIn PDF document text
    • http://waukeganeast1980.com/clients/877304/File/20878321398.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080110f50bb3---65586183663.pdfIn PDF document text
    • http://abwingstop.com/uploads/files/bejedez.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16128fe2be0df5---satudi.pdfIn PDF document text
    • https://www.propertyadvisersaustralia.com/wp-content/plugins/super-forms/uploads/php/files/7719c60476118608783c3dac0639b8ca/86652607856.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_off0000ebda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000103f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F1 10876 bytes
SHA-256: 8f862cbf6864dd261f218cb89bab0cc6b09983a225740119b651c82bbfc7b75b
font_02_sfnt_off00011d10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D10 19308 bytes
SHA-256: 28765fb5d63c05e054f638a15df84fd12ffa2d9426b5a0517484b4191ffff374

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