Malicious PDF — malware analysis report

Static analysis result for SHA-256 787ce835ee6b51db…

MALICIOUS

PDF

73.0 KB Created: 2021-09-19 14:25:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ddf8bbda415dbb8d092b8db6e4c54a03 SHA-1: c12f8bd49346ebf7381da7667dbfabcfa8c6e320 SHA-256: 787ce835ee6b51dbbf0604bbf5fc426f5d345ad68f723f411187ffc8d5c36b6a
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised or disposable domains, indicating a link farm designed to lure users to malicious sites. Heuristics suggest this is a phishing or malware distribution attempt, with ClamAV specifically identifying it as 'Pdf.Phishing.Trojan'. The ML classifier also strongly flagged it as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://queure.ru/uplcv?utm_term=download+movies+online+android PDF link annotation
    • https://atasuorganiktarim.com/upload/ckfinder/files/43086500569.pdfIn PDF document text
    • https://clubsecurite.fr/webroot/upload/files/vojafudidimijoxe.pdfIn PDF document text
    • https://charlesstreetvideo.com/userfiles/file/23982086276.pdfIn PDF document text
    • https://megatex.ua/images/uploads/file/2835194784.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c9f0fc0434---bavowiloparovut.pdfIn PDF document text
    • http://www.neoneofitou.com/ckfinder/userfiles/files/fiwebusetupidamufet.pdfIn PDF document text
    • http://gonganmi.com/userfiles/file/93706851622.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/dasapifelidujukogaxul.pdfIn PDF document text
    • http://yaan121.com/uploads/files/202109070656296930.pdfIn PDF document text
    • http://nuklearmedizin-amro.de/userfiles/file/raminojo.pdfIn PDF document text
    • http://sherwoodonionfestival.com/ckfinder/userfiles/files/46781883217.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/8d6f484749deb0e305b8c8d4a4677b69/95015531642.pdfIn PDF document text
    • http://csc0851.com/userfiles/file/20210917105456_r95oj1.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/ruveda.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/d2407d2bc7abd45de037ff5b4b4ed959/lukejivuxebovonatej.pdfIn PDF document text
    • https://www.singaporemedicalclinic.com/ckfinder/userfiles/files/36734492587.pdfIn PDF document text
    • https://madhubanindiancuisine.com/nbloom/fckuploads/file/sodalosona.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d35afb5f52---wuxuzusasine.pdfIn PDF document text
    • https://szabobuszrendeles.hu/files/files/pijawogurelo.pdfIn PDF document text
    • http://carrozzeriardue.it/userfiles/files/tipaxoridunawabifetasiw.pdfIn PDF document text
    • https://aannemingsbedrijfbarthulsbosch.nl/userfiles/file/84180512366.pdfIn PDF document text
    • http://omatsuri.kr/data/userfiles/files/nusijefukojujarotelim.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_off0000ba5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA5C 10464 bytes
SHA-256: dc37d734ef5bc6a44d71bbcc1012460fd8e995314822f39b9dce1e3f1be3569a
font_01_sfnt_off0000d217.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD217 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ea29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA29 17040 bytes
SHA-256: 426f7d16618dbc15d241b759d371072e12724b9afad997270af8dc81cb831f8a