Malicious PDF — malware analysis report

Static analysis result for SHA-256 d49cd863327caa4e…

MALICIOUS

PDF

72.4 KB Created: 2021-05-03 21:57:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2fedea98ee950ce526add52827ccd78f SHA-1: 4fbe100760c82531c1709ccb93ed7f5ab5abbc10 SHA-256: d49cd863327caa4e83c65b49d990583a25b96a9cbb2560825e07c5757a90619c
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1105 Ingress Tool Transfer

This PDF file is classified as malicious by ML and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to potentially compromised WordPress upload directories, which in turn host further PDF files. The presence of raw IP addresses in URIs and the use of disposable hosting suggest an attempt to obscure the final payload's origin and evade detection. The document body, though heavily obfuscated, contains references to 'Boss katana 100 combo manual' and 'wkhtmltopdf', likely serving as a lure to entice users to click on the embedded malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/eeb17ffc691f5420b8774b58484f3e25/63562817177.pdf
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/16089714b55e8d---sorevimepi.pdf
    • https://roofmed.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160849c09eb300---87778919021.pdf
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cda4b1f3d2---40687278818.pdf
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160860efc4477f---zoledezupejezelukipife.pdf
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160792f158d796---92004823025.pdf
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/cti7qi0e1ids5rrerk4oe0b2va/nefuxitaxab.pdf
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/qipmo79oog6u6j0ucp6iupbkhb/50092299625.pdf
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad5fc479d2---zojomarasasulusejute.pdf
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073e46712db4---nijiwapi.pdf
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608021847e8b7---majodofu.pdf
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160727f9a38ee3---mezig.pdf
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc8eee5cd8---wizofajubuv.pdf
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/6a1801f7aac961b518ddb159e88ef919/79224543916.pdf
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608558988fd95---nexekokuwofesifozi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=boss+katana+100+combo+manual
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e05d.bin
a7259cada9392b353912809f00c6e8f543db9375422f444833beff678e7edada
pdf-font-stream PDF embedded font (sfnt) at offset 0xE05D 5296 bytes
font_01_sfnt_off0000f25b.bin
3ae3cbbe7c57dbb2d2bbd220aa204f63b1f40223f8b143145c7ddd9150c389f5
pdf-font-stream PDF embedded font (sfnt) at offset 0xF25B 10188 bytes