Malicious PDF — malware analysis report

Static analysis result for SHA-256 a70f39e2249b1c15…

MALICIOUS

PDF

87.4 KB Created: 2021-09-15 12:53:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ff74010eb1db94b20d4b89c1fd1d7452 SHA-1: 38670636e9abdb003a40a1a1c48381634d5b0f26 SHA-256: a70f39e2249b1c150ba22961ce0933e67b3f43a7dd7cbc894ee070f434537903
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to various domains, many of which are hosted on disposable or potentially compromised infrastructure, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure itself is designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://englandmatchshirts.com/assets/file/95314034784.pdf In PDF document text
    • http://medicom.pl/userfiles/file/pezovisig.pdfIn PDF document text
    • http://stellarp.com/userfiles/files/puwoxevumoxobarexobinu.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/c6aad362daced46e957a449b0eb5c7cb/47359922165.pdfIn PDF document text
    • http://merwepizza.com/upload/file/31973587042.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb0e0d1ed2---deneb.pdfIn PDF document text
    • https://avflash.nl/upload/files/25397430241.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/89486037981.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/70573882902.pdfIn PDF document text
    • http://reversetheclocknow.com/ckfinder/userfiles/files/20254432376.pdfIn PDF document text
    • http://thuexe7cho.vn/upload/files/57947175346.pdfIn PDF document text
    • https://ebooksweb.net/files/file/rigitugewosuvo.pdfIn PDF document text
    • http://htygroup.com/upload/files/rarijikodupamex.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c807aa2d57---banujoxizuri.pdfIn PDF document text
    • http://koreanhotpot.com/uploads/files/ponesuvakejujimujizuw.pdfIn PDF document text
    • https://xn--90aoja6ahg5ds.xn--p1ai/uploads/files/marud.pdfIn PDF document text
    • http://secretinvitation.net/images/files/papimitupe.pdfIn PDF document text
    • http://an-ocn.ru/ckfinder/userfiles/files/nazujuvul.pdfIn PDF document text
    • https://forumsevens.com/images/file/43423895611.pdfIn PDF document text
    • https://energiadirect.pl/application/resources/ckfinder/userfiles/files/femikavomer.pdfIn PDF document text
    • http://dlabiura.kbo.pl/ckfinder/userfiles/files/29077910719.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/27069823277.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=what+can+i+do+with+kelp+in+minecraftPDF 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_off0000efa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA8 18180 bytes
SHA-256: a715205eed85f09240fa28789d4f06332445387771d3f715828b15e73f327b81
font_01_sfnt_off00011ecc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ECC 10888 bytes
SHA-256: 74657bb0c87a6911f1fb616620724f5b678f835fdd42e0065317cb8ff2e823af
font_02_sfnt_off000137cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1