Malicious PDF — malware analysis report

Static analysis result for SHA-256 c840b4cdaa0aeaf5…

MALICIOUS

PDF

83.1 KB Created: 2021-09-07 08:34:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c348f61e2a9a9abc704b438654be408b SHA-1: 6923afc809add7b0aa9ebd280fb0b609d6526ef9 SHA-256: c840b4cdaa0aeaf5f5dd34a052ecf58fac34ded69dcc5e15eac5a94148de8bed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF 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 CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://xn--z4qq44i.tw/upload/actfiles/90077635009.pdf In PDF document text
    • https://grupo-kayros.com/userfiles/file/79926128146.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/97f3f042452ae32d5fbd7ed089934fe4/81780438220.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/9d00798227249420226adf66418ff87e/libesegurakukoxoredobi.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16098f804daeed---tujudabipuvukereb.pdfIn PDF document text
    • http://vpecargo.com/userfiles/file/vazufulibuwuw.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3cc1cb36b2---bebobep.pdfIn PDF document text
    • https://promise-land.com/upload/file/47340461943.pdfIn PDF document text
    • https://alrukn.co/userfiles/files/tiradiwimime.pdfIn PDF document text
    • https://facades-et-traditions.com/actualites/file/batozufarekuzujipa.pdfIn PDF document text
    • http://inarchengineering.it/userfiles/files/25118343246.pdfIn PDF document text
    • http://handlpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/41847351556.pdfIn PDF document text
    • http://instant-image.net/UserFiles/Site/File/foxitavagatovotut.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c18f2f65485---3040167481.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/8f76edb8d63367132533a00504c4c777/33640853145.pdfIn PDF document text
    • https://digireg.dk/upload/gudazosa.pdfIn PDF document text
    • https://a5productions.com/home/a5pro/public_html/ckfinder/userfiles/files/83664569740.pdfIn PDF document text
    • http://csc-021.com/userfiles/file/20210817225502_egi57o.pdfIn PDF document text
    • http://iseveranscopy.com/upload/editor/file/sejope.pdfIn PDF document text
    • http://bighost.vn/uploads/userfiles/file/jekujusajopob.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb48fb2fc1---ribajajuzenuwabenad.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e33f1bd632b---83742531147.pdfIn PDF document text
    • http://snotlicker.com/clients/10243/File/47327076272.pdfIn PDF document text
    • https://uslugiinzynierskie.eu/eurostyl/photos/file/39139788107.pdfIn PDF document text
    • http://gillsandgeckos.com/userfiles/file/lefapun.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/nofovunufojoraxul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=standardized+test+examples+pdfPDF 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_off0000e032.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE032 10776 bytes
SHA-256: cc0a55c285e4d53c195f33dbdb43adf3dbfadf0d8fc66bce587d3c9dc017259c
font_01_sfnt_off0000f8fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8FD 17600 bytes
SHA-256: 01807c99c9a3050ad75a9e611e1dc1ade44cbf56fe2f26cbd6ca43940119e8bc
font_02_sfnt_off0001265c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1265C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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