Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c40ae72304f7a2e…

MALICIOUS

PDF

83.5 KB Created: 2021-09-15 20:46:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f418ed1c4f145839d1c609d5dbbcf6a3 SHA-1: 13597dd2c95904ad69ef2653fa1294fc3aed5484 SHA-256: 3c40ae72304f7a2eb86fae613cfed6fbdfb9b814f736b1d2e36a5d6873afa98b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites. These links appear to be part of a link farm designed to redirect users to download files, as indicated by the 'uplcv' and 'utm_term' parameters in some URLs. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e9f294efce---67757903862.pdf In PDF document text
    • http://snp-ent.com/files/fckeditor/file/2407546576136bd1c84362.pdfIn PDF document text
    • http://matras-devison.com/upload/file/kezik.pdfIn PDF document text
    • http://iberryhomemade.com/userfiles/files/66532793704.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/6431216600.pdfIn PDF document text
    • http://viacaosaopedro.com/www/js/ckfinder/userfiles/files/rujoxuxumobopemibugewuze.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161382b44ce832---nupakenuxofabodelojabok.pdfIn PDF document text
    • http://domuran.pl/files/file/xudodenibudotubomige.pdfIn PDF document text
    • https://highfieldhousehotel.net/nbloom/fckuploads/file/matipenemevagili.pdfIn PDF document text
    • https://magnanelli.com/userfiles/file/33023280487.pdfIn PDF document text
    • http://air-con.ru/upload/files/kazetovej.pdfIn PDF document text
    • http://ambvetfanini.eu/userfiles/files/13200066208.pdfIn PDF document text
    • http://sweethomedelivery.com/ckeditor/ckfinder/core/connector/php/uploads/files/82659512174.pdfIn PDF document text
    • http://vibrobeton.by/pics/files/54316283783.pdfIn PDF document text
    • https://sharmtocairo.com/userfiles/files/fedidelepamiweweg.pdfIn PDF document text
    • http://www.leposeur.fr/site/upload/ckfinder/files/59177566280.pdfIn PDF document text
    • http://creativetechno.in/userfiles/file/35531278774.pdfIn PDF document text
    • https://colakcivi.com/userfiles/file/gitizegexenusamiroladux.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/131bc50ea8672288a4597ad76d1b4b64/kupasodedavawupejetopolim.pdfIn PDF document text
    • https://ce-mi.pl/uploads/userfiles/files/jagasixivaxeb.pdfIn PDF document text
    • https://bruceleevideos.org/images/file/82725061170.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/161394264827a0---zezarazopitana.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=gta+san+andreas+lite+ppsspp+downloadPDF 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_off0000e04d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE04D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f85f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF85F 18100 bytes
SHA-256: 8025b4ecd5ae842526806fe6601e17832751aa7ef6afd05ae5046891ef12af8d
font_02_sfnt_off0001281e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1281E 10508 bytes
SHA-256: 75f21060b3d632ab5f9f622e6ac1fa531ad20f8b78b5af2a889dcc94e9ac3d19

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