Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1239fc86130eef9…

MALICIOUS

PDF

84.9 KB Created: 2021-06-13 14:49:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: c50eb42ee6c9f75df8d2f13ce4f63e85 SHA-1: 33eede7b5faa6ad97f74a2f14ce1d8170c0f6b77 SHA-256: e1239fc86130eef98226c68149862d79b085052a682b3d85a625dcc0179f6cb4
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1204.002 Malicious Link

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

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://allytemp.ru/uplcv?utm_term=synapse+roblox+mobile PDF link annotation
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af7d3d9eb20---jikutaroxoruxonatesoxabaf.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609590b862966---96195306308.pdfIn PDF document text
    • http://mgocsm.in/userfiles/file/57944461671.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/e1584d0d61f14ff3afe70f9e609dfe55/83314820804.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/o8coldutoj7smetv6fnag4riri/66884393603.pdfIn PDF document text
    • https://mimpishio2bet.com/contents//files/zepebod.pdfIn PDF document text
    • http://thietbixanh.net/uploads/files/2597624950.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec595c3ea3---61775950346.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160719880c22c1---felogobubosiludetuwawanaz.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/8631028d42ae5f7ae4246191b759c6c1/62243151339.pdfIn PDF document text
    • http://energy-labels.com/userfiles/file/46936138054.pdfIn PDF document text
    • https://cdpu.net/wp-content/plugins/super-forms/uploads/php/files/efb7e7599d6ad7ded1c0d2f09de1e049/22902493304.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/agaqe889g3ojpsgrmrdb1sv879/54642202378.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6hh9kvomv3t5objfke7cghdn60/duwapitiduxov.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/4r26mll545v6bjc5s5pqtbfod2/fizotidu.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160859173b7d48---kaxogomoda.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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_off0000f3b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B9 5088 bytes
SHA-256: de82cf98c622857470b479230712d89fc8a2c90c9d210dc97f9bed709246b2b5
font_01_sfnt_off000104d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104D0 2224 bytes
SHA-256: 9f44ab994e88fc4f353c769b49a51a67d106ccd2cf0a39527612db6f79245cd5
font_02_sfnt_off00010eec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EEC 11680 bytes
SHA-256: 85adf6588a968e3d95d84125170c50aa60c10c9c9fb991f458c7fac15ca7e479
font_03_sfnt_off000136c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136C4 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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