Malicious PDF — malware analysis report

Static analysis result for SHA-256 16a3783df051f9f3…

MALICIOUS

PDF

81.4 KB Created: 2021-09-04 12:02:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4edb140f0ff431bc4c17686f01f56787 SHA-1: 9cec0136ad302c830faad84dba4e05493c149785 SHA-256: 16a3783df051f9f32f6af44c9df68e47e7c2d2cbdd21d3b72bac871a34ddc8b2
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress sites and other domains, likely serving as lures for phishing or malware downloads. The presence of multiple external URIs and link farm indicators strongly suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://inwebjor.ru/uplcv?utm_term=reducing+the+size+of+a+pdf+in+acrobat+pro PDF link annotation
    • https://iguanapools.com.au/wp-content/plugins/super-forms/uploads/php/files/9gh7do984e1g234u7mpbqos49l/pojefilazonov.pdfIn PDF document text
    • http://getdol.com/page_data/file/97844496244.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/3dckmloepi78fklms5p1lo6fh8/82342811382.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16079f40d292dc---valapojagubodewidajis.pdfIn PDF document text
    • http://uteambio.com/upload/files/judazidodarudutuze.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1608e67b7552bd---memariris.pdfIn PDF document text
    • https://avayemehr-carpet.ir/data/file/22793804281.pdfIn PDF document text
    • https://royal-art.pl/uploads/userfiles/files/robesofexuwaxunijimuva.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/01fth89lbpi2id9a4qqsonv8id/sojijulikezibonekenaj.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/dc2cba0a5a1398abebbf16f77400e30f/dexuper.pdfIn PDF document text
    • https://gotoko.com/cmsv2/upload/files/95657880111.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/fd5588b24451497d74e1e334ee518360/dakovovipor.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078bd8c09fb3---43784140836.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/117336b79296147c54781768ac2ceda4/pulewajikazamewulesorubum.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/23618081517.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d40d35b2027---20957732708.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c68bab6bac---12572830956.pdfIn PDF document text
    • http://marymo.ru/uploads/files/josovafegagumoxer.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/8f703438732b012797c8f7f97ea64fe1/nemisopevowipejagumenowu.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/4e5e0f91d152dad2b7e2cc2f9594b02c/pipipamolonarawebo.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/09e9e488fd84514bb820e579ab3ded95/jimoses.pdfIn PDF document text
    • http://hnsunnyfood.com/d/files/jamafular.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/daa5461e573983c67421a4c7799b5efb/54176680194.pdfIn PDF document text
    • http://elcampoeco.org/FCKeditor/file/fulupejalaxigi.pdfIn PDF document text
    • http://intranet.uts.edu.co/portal/app/ckfinder/userfiles/files/2637092219.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_off0000db6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB6F 16612 bytes
SHA-256: dbd3e91fd89c7a6e1886b61c490b7bd7fabf9f29a8488c9c0236b6f24c88afe9
font_01_sfnt_off00010648.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10648 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E5F 11200 bytes
SHA-256: 593b6a763bb92ddef01cd8507cca95ae7305e9876c222be937debf52ecf52a63

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