Malicious PDF — malware analysis report

Static analysis result for SHA-256 8493d966fc8f367c…

MALICIOUS

PDF

114.6 KB Created: 2021-10-06 02:02:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: a2b3cc85cd57f4b5f26d3c595afafc46 SHA-1: fae23f84c60f5382baa55d5e988b060feb666cb6 SHA-256: 8493d966fc8f367cb0bf98d7958a2973e6d502a6ec05c08fcceef39b13e32ae1
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to potentially compromised WordPress upload directories and other disposable hosting, suggesting a link farm designed to redirect users. The PDF structure and embedded links point towards a phishing or exploit delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 http://leasingtowers.com/ckfinder/userfiles/files/42988517786.pdf In PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161449d50be6fd---wutijaveb.pdfIn PDF document text
    • https://jairdefreitas.com/ckfinder/userfiles/files/rutusatigunan.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/lojigomisid.pdfIn PDF document text
    • http://doanekeyes.com/userfiles/docs/vowesotokepivawisijuzanu.pdfIn PDF document text
    • https://yuktogel.com/contents/files/bideposidobabovunopuvev.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/161360065ce21d---94687183887.pdfIn PDF document text
    • https://ntct.dz/ckfinder/userfiles/files/xirawunezixemadumubunibe.pdfIn PDF document text
    • https://sme.bankai.lv/ckfinder/userfiles/files/31623376732.pdfIn PDF document text
    • https://bonvoyageindia.in/ckfinder/userfiles/files/14522875081.pdfIn PDF document text
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/nifar.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/s40mpehopafk33a6pj4ae5umr8/bobugewiramofovemoside.pdfIn PDF document text
    • http://fuerst-architects.com/uploads/file/97849128795.pdfIn PDF document text
    • http://ipllaser.in/uploads/gefuvawefel.pdfIn PDF document text
    • https://buffinvestment.com/upload/ckfinder/files/gowiramazaxekasagekus.pdfIn PDF document text
    • https://savitravel.ro/ckfinder/userfiles/files/13707032332.pdfIn PDF document text
    • http://www.likoda.com.tw/upload/ckimg/files/76038821710.pdfIn PDF document text
    • http://qhzs88.com/admin/fckeditor_upfiles/file/2021100606214080554.pdfIn PDF document text
    • http://ventss.ru/userfiles/files/tipojav.pdfIn PDF document text
    • http://hutnia.pl/userfiles/file/55844905114.pdfIn PDF document text
    • http://shsuorui.com/uploadfiles/fckeditor/20210918/file/16319487524937.pdfIn PDF document text
    • http://quranday.org/userfiles/file/90960642698.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=liturgy+of+the+eucharist+sequencePDF 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_off000156a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156A9 20924 bytes
SHA-256: a91a536c8424cafec37bf352f6d19efd5091416dfe652d98cfc8d06d8c47fd90
font_01_sfnt_off00018b47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18B47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001a35e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A35E 10888 bytes
SHA-256: e9afff810a92d3f1d74ac15d733ebfb55ad842f547322c8dc74848add0fc13f5