Malicious PDF — malware analysis report

Static analysis result for SHA-256 d824bcfe528c7edd…

MALICIOUS

PDF

96.7 KB Created: 2021-06-27 03:44:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f0b28d563c6ad84237d02351b1910510 SHA-1: 686509ec448372fcfec15f78bb5262a7e9f00279 SHA-256: d824bcfe528c7eddf5b4ab839126fa55cb71a2f1ccaefdb6851bed4696cc3501
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to compromised WordPress sites, suggesting it's designed to lead users to malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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=nonsense+meaning+in+kannada
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/460d9df8cdb4fd798e9a2d40788a5fbd/65275570934.pdf
    • https://fotobolfestmeny.hu/mvc/userfiles/file/96136023108.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087241282e31---nutetupodopovinilavigoro.pdf
    • http://1960whs.com/clients/7/73/73384dfd0d582a2861cf356c55c3c578/File/zejer.pdf
    • http://dabaizhongxue.com/upload_fck/file/2021-5-23/20210523151719668553.pdf
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/c9mokkhvami03l8nk4v2h946s6/52146062284.pdf
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c8cb373fc04---folatenitavo.pdf
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/16089ca69b9355---72452247510.pdf
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af5fe6cc65d---duvudim.pdf
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/52736527583.pdf
    • https://delphin-bau.com/ckfinder/upload/files/76354923974.pdf
    • http://vksraja.in/fckeditor/upload/file/tizewinerut.pdf
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f6e3aea06a---47798825032.pdf
    • https://stopserv.ru/files/file/1973947385.pdf
    • https://apz-arte.com/ckfinder/userfiles/files/joledurisazopet.pdf
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/suweregukefexamo.pdf
    • https://arrayamed.com/userfiles/file/rofeniporafe.pdf
    • http://www.toptehnik.si/images/pexivariwurikiwunuxudepad.pdf
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/1741adfcb4f8da00d3c9e69bc5478953/ranaga.pdf
    • https://coluer.ir/documents/file/84106505228.pdf
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/5f26789041a74800fcc757a2cfbb5b32/suwedixogi.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000d847.bin
4f0e87a20221825af1d591b6a3183b2fad9bfd3ac1da1abb547b49e4e49277d2
decompressed-pdf-stream PDF FlateDecoded stream at offset 0xD847 19084 bytes
font_01_sfnt_off0000f896.bin
8c3e117014ef534510b5a3ddb8e25d24c5951c8e79d53127e74336fd586135c8
pdf-font-stream PDF embedded font (sfnt) at offset 0xF896 5132 bytes
font_02_sfnt_off00010ab8.bin
8e6875ddc07a4b1bf764e2469437993c7aad1a33c4416b5943ae265749f4674d
pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB8 24392 bytes
font_03_sfnt_off00014516.bin
bee267c7aff789285a76c1769dae57696d294c152666384609c95d52802bdd65
pdf-font-stream PDF embedded font (sfnt) at offset 0x14516 10416 bytes
font_04_sfnt_off00015c77.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15C77 16792 bytes