Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdd183a2d673c527…

MALICIOUS

PDF

85.9 KB Created: 2021-07-13 21:31:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 183661f9c314992df63ac28b63a5a667 SHA-1: 45106ee7f56698877ff9c0cc05392a6f187e3f2b SHA-256: bdd183a2d673c527332118ae5c0414b932720d19b3ea1cc9e237b48c55849bd4
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains a link farm pointing to multiple compromised WordPress upload storage locations, suggesting an attempt to distribute further malicious content or phish users. The document body is unreadable, but the heuristics indicate a malicious intent related to external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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 http://travellightnepal.com/userfiles/file/jefupi.pdf In PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/vumamukasebebafanaja.pdfIn PDF document text
    • http://charugarware.com/DEVELOPMENT/charu_garware/uploaded/userfiles/file/63569848715.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/61425748668.pdfIn PDF document text
    • http://www.cerathai.com/image/upload/File/2317430770.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a59a1ee7f8e---90060559254.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160716bed29465---koridukuxoliruvunubuf.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d23e24c3289---64803418142.pdfIn PDF document text
    • http://stin-verdon.fr/assets/Image//files/wifejojufel.pdfIn PDF document text
    • http://kbchina.de/upload/wogokivoredoxariremadoge.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/eqqdk7quock0276p8nkclmjev3/66856275299.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac722615b8f---zixufowamisikir.pdfIn PDF document text
    • http://lubrifianti-auto.ro/files/file/mokir.pdfIn PDF document text
    • https://baptistfriends.org/media/vefavulapaxo.pdfIn PDF document text
    • http://velo.hu/UserFiles//file/sobom.pdfIn PDF document text
    • https://gamma-electronics-eg.com/userfiles/files/sekokivurabenumaxuzev.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/75cdb7196fc345211780094ca53b2356/zewoxudufeluloselagaka.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a566bdd0f---xelowepatufatakogejoze.pdfIn PDF document text
    • https://amblamy.ee/upload/file/34170741288.pdfIn PDF document text
    • http://poorclarescork.ie/images/22234091597.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc9c81307b3---fizevo.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/1201752b94978343b0848d1a726df98f/rurozejofo.pdfIn PDF document text
    • https://sahodayabbsr.com/test/fckeditor/file/gapodu.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/251632t60bqvt1aliob3n95f45/zunufavaruwe.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a1ea06419b1---nunufobutikefivemofeb.pdfIn PDF document text
    • http://pkynfe.net/userfiles/file/duzabubabexezifogedaluxij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=classical+and+neoclassical+theory+of+managementPDF 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_off0000ef64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF64 15856 bytes
SHA-256: 0902570a5f35dfd01c62eef62dddc1e1689071f5d35c829871e4b0da4f1e1812
font_01_sfnt_off0001184f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1184F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013066.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13066 11068 bytes
SHA-256: e52edfb24eb8f237ffd3953c129a10a6c5b6d728f8fa6d2d567c61cb62cffc0a