Malicious PDF — malware analysis report

Static analysis result for SHA-256 30a92e41c017b3f5…

MALICIOUS

PDF

94.0 KB Created: 2021-06-18 11:49:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 6bb1ee61793169d88a0b45f54ce5be06 SHA-1: a37e3a24d583e7e095b7c9ca068fd962138d51dd SHA-256: 30a92e41c017b3f50ecab3e00619327f4b22dd30b03f1cd35454a8fd52f8cdf9
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content or redirect users to phishing pages. The presence of embedded URLs and the nature of the link farm heuristics strongly suggest an attack pattern focused on luring users through compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/14e04174ee02732d23f11c8f6ba9d133/68106368552.pdf In PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608d54cd62cd6---paregu.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/a3ee72147a2cd2d6f2df4e459d8d7585/mebivamo.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/v4md8rimvg8kgmc3pn2ggkfhm5/zakugepexufawuz.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/d2bae8c944227af526a43f3a00e28c86/87916338031.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160909f7456eaf---28330594875.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609df2a9191ac---wafumipedusirizidatek.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210524130110114.pdfIn PDF document text
    • http://clarasonic.com/upload/file/24590869053.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/67bca8e6d51168208a6b45c3f951b4ed/95561160768.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/kafowa.pdfIn PDF document text
    • https://notrepanierbio.ch/userfiles/file/83097065414.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/98dd796a0ac6d4eae375dcb14b9a1813/guvubanutujona.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/PmAiG5ZyT-k/uplcv?utm_term=123+pinoy+full+movies+2019PDF 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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00014c19.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x14C19 19700 bytes
SHA-256: 168280714ae278d18f50ef808d64eeca557a7f296acf4638688702dc992f8db5
font_00_sfnt_off00010cf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF7 5452 bytes
SHA-256: 494a2f13c6636a7ce7f96ed32b6f42e8528c816998a344528bef65c1cfb7e63a
font_01_sfnt_off00011f8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F8C 13572 bytes
SHA-256: 7cedc13e545086a782ec6cda4681339d1c747ae06124cc70142acb73494381eb