Malicious PDF — malware analysis report

Static analysis result for SHA-256 e32f4d93c42f4714…

MALICIOUS

PDF

117.7 KB Created: 2021-06-19 19:26:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: b188c0cc9964d753a14e0af92597fd83 SHA-1: 8cc78904f08c0a01d62656f450562847a0b072d7 SHA-256: e32f4d93c42f47146ef848042f959575b8cd6fd4ab141fb6b439beafa5d9a67b
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

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 https://queure.ru/uplcv?utm_term=inner+engineering+telugu+pdf+download PDF link annotation
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b779f6b8170---burezinemabosageremome.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/8bc69iptaf39s3hu3ug3iqt5d7/zesatotagizoxarujup.pdfIn PDF document text
    • http://93564497.com/userfiles/23825751857.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae4b5221ed---bonuj.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a769d5474e1---95213232959.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/900vb17l57h3pfn3lu103ejq52/voxezonedoleg.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c91f6319f0---17798188541.pdfIn PDF document text
    • http://khodahoanglang.com/admin/webroot/upload/image/files/dogudabegonitufiseda.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1608325347a1b2---40093271043.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1606e4edc6fb52---93553533299.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/35351791459.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/9a63f7b047b3dde582f84df355920a86/32680743474.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/v39dvp9uab1j5bltt38588as26/30009340689.pdfIn PDF document text
    • https://superpart.com/files/71057055465.pdfIn PDF document text
    • https://tl-systems.hu/files/files/kabadasixeza.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • 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

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013f79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F79 5060 bytes
SHA-256: 845a88dfc98566f19b4d010f3d0f2ec02429f854ae962d4b9b1984b86a151e6c
font_01_sfnt_off000150d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150D7 30432 bytes
SHA-256: 5a96986c72e08367019f72651c6ed166b3f1362a1bfbbbc42b8455ebc9403c7f
font_02_sfnt_off00019251.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19251 4376 bytes
SHA-256: a3c2807456e5966aa3ee04409da4eb086d5f933387568a3c659f0f9dc6b64ce4
font_03_sfnt_off00019e2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19E2F 11784 bytes
SHA-256: 10e61e19bec46bd1197b912921d391c0b6a6db776a532d03431d526ce4087551