Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1bd8e3101ab7b69…

MALICIOUS

PDF

76.8 KB Created: 2021-06-08 20:41:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: fd8d647d0b1f6c57c436fa5da3b255f6 SHA-1: 43f03f0dd511952d21bde167e5750af071f19d8e SHA-256: e1bd8e3101ab7b69abdd7484ab837b8ceeb7a5bf71d810bab3406f5e6e131621
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to compromised websites, many of which are hosted on disposable domains and utilize form-builder plugins for file uploads. The embedded content suggests a lure for downloading a 'Bangla dictionary app', likely a pretext for delivering malware. ClamAV detection and ML classification strongly indicate malicious intent, consistent with phishing and potential malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://garglob.ru/uplcv?utm_term=bangla+dictionary+app+download+for+pc PDF link annotation
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b8c011cdc---16114215486.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/62c4fbba72f82f962ee8a20baeec5702/86133653292.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/8193ee66e403e2909a38cdc1fe4aa8b6/62818249909.pdfIn PDF document text
    • http://asustainable.com/global/file/ribapidova.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/2cc9a0c9902bf2ecfd6b03edc9004b12/lejof.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160bbb3640f2d4---nesuzefe.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078f2d8695c4---2022565002.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071c1947948c---83410791547.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/5r63anh8ue8qijhir5ri7s453l/goridajegad.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/8d6f143583155d45b78379b475b2814e/peruki.pdfIn PDF document text
    • http://vksraja.in/fckeditor/upload/file/nujek.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3d9f88bc2---136371425.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/fe4ae83b2cee0380561e2fbeab7c6e2a/68321447232.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dff8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF8 5056 bytes
SHA-256: 8841f332bebf670b38e40e0f97266c4058e224f7376513fb6d22c41e8d5e9289
font_01_sfnt_off0000f143.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF143 10884 bytes
SHA-256: 9fcad0d81b153ae03442bc361c55164cb44c74a26fc998528dc8995e9417c6f8
font_02_sfnt_off0001167c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1167C 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176