Malicious PDF — malware analysis report

Static analysis result for SHA-256 a944154890fae4df…

MALICIOUS

PDF

89.1 KB Created: 2021-06-18 07:53:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: c4464d76f97fb570dead38b9e64878c9 SHA-1: 254e18ab709a25139396e6cbb869589eeaf13c24 SHA-256: a944154890fae4df47d9d0a76ea4bbb3209435e482db51aa3935034281b056cb
156 Risk Score

Malware Insights

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

This PDF file contains a link farm, directing users to multiple external URLs hosted on compromised websites. The presence of numerous links and the use of disposable hosting suggest an attempt to distribute malicious content or conduct phishing. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/32cd5b3a6fa76a5821d0fb9a3ce2bc9c/94507867850.pdf In PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16087150e3b547---fivusubefigumobirimufo.pdfIn PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/17396256112.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/jalosalutomefixug.pdfIn PDF document text
    • http://palami.by/images/file/82475333890.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021050308355273499.pdfIn PDF document text
    • https://airshow-bg.com/file/5310235367.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/d18227007e636613ceca92a9762b25f3/jokuvumepufinili.pdfIn PDF document text
    • https://www.tanyadantus.com/wp-content/plugins/super-forms/uploads/php/files/398515a1165f24d7a685dea43133b4f7/75884482418.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077f2040f7d3---rerukadikefuzari.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/af70458cb8f67a5b9c83aa4a6d4a6115/gixowitoxugutibapori.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/87482038777.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a7fb7853f7---vonatiz.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c17ed59b33b---mezujimafaxibijuferim.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=wallpaper+miku+go+toubun+pngPDF 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE33 8700 bytes
SHA-256: 55c01a8673a4b8fa458e2533643e7b7659a0f493c5d2e2152aff9f7da7ff1f35
font_01_sfnt_off0000fb9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB9E 5180 bytes
SHA-256: 047212ff1c90391eec8a64cd14c1d45091d38fa96657eedd917a9314ac866095
font_02_sfnt_off00010d2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D2E 1852 bytes
SHA-256: 59b64e1cdd9bcf273575d962d887d6acb5f1267816db113bcfc72c2fcc02419a
font_03_sfnt_off00011641.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11641 12452 bytes
SHA-256: 1cc1a0c17c61f3b6eb4cc7bdfcb1d65c5cd15ed54800b25e2ab61e3dddcffd1a
font_04_sfnt_off00013fad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FAD 16480 bytes
SHA-256: 31fdad303d89efd4e811342b1d2292f934179471b299869721fd5a08f1521e74