Malicious PDF — malware analysis report

Static analysis result for SHA-256 13294eec47773cef…

MALICIOUS

PDF

94.1 KB Created: 2021-08-09 17:49:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6fb4cfbd5ac5302a430b2cf578d5429b SHA-1: a23b4a4e237382a309d691082441faa9182d0c88 SHA-256: 13294eec47773cef4a98f0f26fc14901167afb3380899127480cdcb808f918a9
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. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress upload directories and other disposable hosting. These links likely serve to distribute further malware or lead users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/aca760275fbf80225443fd24783b5dbe/12612050432.pdf In PDF document text
    • https://ahreco.com/uploads/news_file/7630574545.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/db5582aefe3a20c4e1986455d043214c/bokiwabetefixevidufupajo.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/ru700i7rgunb2h136464u0hk77/87146089222.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/36549880491.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607931d40c87a---tofej.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/dilanofiwi.pdfIn PDF document text
    • http://frangarcia.eu/upload/file/72934258420.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/shc21coefem4posumrm4acaaua/19935320086.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/rujuxizab.pdfIn PDF document text
    • http://hms31.ru/img/file/josenuvefozonivavemuba.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16086094573c5a---96704708353.pdfIn PDF document text
    • https://wkd-uk.com/wp-content/plugins/super-forms/uploads/php/files/e39021f45cacb98288be70a0513460d4/44186788107.pdfIn PDF document text
    • http://archgeo-leszno.pl/uploads/userfiles/files/genij.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/64863804081.pdfIn PDF document text
    • http://www.superior-inkjet.com/login/ckfinder/userfiles/files/bufemawijaliwafekexob.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/c6dbd21eda5b5808c721ac82c27d4125/20683590387.pdfIn PDF document text
    • https://bosgo.mn/uploads/files/sitotowa.pdfIn PDF document text
    • https://thingstodobahrain.net/ckfinder/userfiles/files/4487661435.pdfIn PDF document text
    • https://murtenhof.ch/userfiles/files/kakiketumijuvobuzerale.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b035c7eedd---60310139535.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/60275487335.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=free+tenants+in+common+agreement+template+australiaPDF 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_off00010ae0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE0 17732 bytes
SHA-256: bc0c0c626931c72c466b3b3d4402041315ff1ee7560d43f0f821d7b254d781ed
font_01_sfnt_off00013984.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13984 10792 bytes
SHA-256: a98a2d96bcc4250df51b46c8f57381d92bdc67b3c3e2a3daae4fc5f83d56b197
font_02_sfnt_off0001525d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1525D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1