Malicious PDF — malware analysis report

Static analysis result for SHA-256 36b66f64875a0e93…

MALICIOUS

PDF

82.8 KB Created: 2021-09-13 09:35:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 1368d7b6ac4dc555ef0832ee6ec2ca3e SHA-1: 85a06b5557d6ac04087ca203a7e52bea0c9ca28e SHA-256: 36b66f64875a0e9304b7d3ead9f3a3adc5035e4509ef9502b8c97606e778d4cc
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, many of which are hosted on compromised CMS upload storage or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery via these external links. No scripts were extracted, but the structure and URL analysis point to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://vkgnassociates.com/dayafter/uploadimages/newsimages/file/zadamivasovugazepegulopig.pdf In PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16137da3da41ee---56573304786.pdfIn PDF document text
    • http://escrima-rlp.de/userfiles/file/velativefanuv.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161361171bd70e---81049722489.pdfIn PDF document text
    • http://dongamold.com/fckeditor/upload_files/file/gapigejo.pdfIn PDF document text
    • http://cartopack.be/Images/file/9503892298.pdfIn PDF document text
    • https://vanvoorst.info/uploaded/file/lalip.pdfIn PDF document text
    • http://haphadoor.com/upload/files/lasewagitikis.pdfIn PDF document text
    • http://linhkienhunganh.vn/luutru/files/dipuxirijewoxivadexute.pdfIn PDF document text
    • https://thebottombillion.org/business_school/uploads/file/33124475530.pdfIn PDF document text
    • https://miguktour.com/FileData/ckfinder/files/20210902_4CA182B564AA824E.pdfIn PDF document text
    • https://soccerauquebec.com/userfiles/file/24599328678.pdfIn PDF document text
    • http://flapboxes.custompackageboxes.com/userfiles/files/85414896585.pdfIn PDF document text
    • http://china-baby-clothes.com/d/files/21505665608.pdfIn PDF document text
    • http://marisqueandopremios.com/campannas/file/zomaseja.pdfIn PDF document text
    • http://salon-urody-bellis.pl/images/file/13363358537.pdfIn PDF document text
    • http://qianxi.cn/filespath/files/20210901091335.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/d7d0a4351d6cd3dfad79c41d63a21479/29795312302.pdfIn PDF document text
    • http://kadet-ck.cz/pic/file/40719312471.pdfIn PDF document text
    • http://autoscuolapezzano.it/userfiles/files/76826757383.pdfIn PDF document text
    • http://www.haztartasigepszakuzlet.hu/pics/file/16364149021.pdfIn PDF document text
    • https://tybistanbul.org/resimler/files/mujibeja.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=the+best+reminder+app+for+androidPDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/bolifibosase.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_off0000dff8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f80a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF80A 17304 bytes
SHA-256: 006c27cf9443e8f2f0f44839cf567feebffb79e75ce0a52d14a414f9334e6b35
font_02_sfnt_off000124da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124DA 10820 bytes
SHA-256: 31edde81ae7bcfd60cfdae00fab313f314915456214eb3beb3eee8d8fb944b34