Malicious PDF — malware analysis report

Static analysis result for SHA-256 8685be34d822800f…

MALICIOUS

PDF

84.9 KB Created: 2021-08-23 11:53:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3c3e07c3601e0c9f3c0c666e39087b7b SHA-1: b50eaac6360d39e834954d22e41eb80859bd2aef SHA-256: 8685be34d822800fbb36e0ba22476a367df4d215ae7a4f12dfa5d4243006efe8
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and disposable hosting domains. These links likely serve as lures for phishing attacks or to distribute further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://coretry.ru/uplcv?utm_term=lotf+chapter+9 PDF link annotation
    • https://promobryansk.ru/userfiles/files/30528740611.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/9894a77b9f72b42a7ea1c06b75aee960/lapoputamuf.pdfIn PDF document text
    • http://thangmayedex.com/webroot/img/files/13513515433.pdfIn PDF document text
    • https://mobilieroccasion.fr/uploads/file/69006104546.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa1a698ea5---66731074094.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f420cab66---89938342524.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161194fdd1195f---13125889609.pdfIn PDF document text
    • https://cupanghitam.com/contents//files/litotagatoriferawigog.pdfIn PDF document text
    • http://mnogonomerov.ru/uploads/file/ruteboxajifapedepawu.pdfIn PDF document text
    • http://sanga.asia/userData/board/file/76313561434.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/u8n95cu557m4cmucmgvk9l69o4/nisevosuzopewetuzana.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/afbf35c439c16a0adb48b98ed50bb5b1/kiropoxovebegujoropunites.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/o4tj8tvmditt4rjnp78lpr3d55/82841571572.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/551946054bdbeb7f304a887bdc982e7c/sibusenupimovu.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/goxufebenos.pdfIn PDF document text
    • https://yellowmangocafe.com/userfiles/file/4920951144.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/82e5bba18580e3bcbeae22b089d2123e/10269842251.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160844d9eb44d9---reloweluvisusoxowadapor.pdfIn PDF document text
    • http://lubrifianti-auto.ro/files/file/16384221715.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f85f6c3526---20897543180.pdfIn PDF document text
    • http://startmatbaa.com/userfiles/file/taguzixevufurulafokev.pdfIn PDF document text
    • http://gw73patriots.com/clients/1/1e/1ed986c9d410becccfd9995a8318e329/File/buduvago.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/92383306480.pdfIn PDF document text
    • http://desagresbrts.com/clients/34568/File/33631722610.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/84358570202.pdfIn 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://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_off0000eb69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001037b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1037B 16540 bytes
SHA-256: d2e161a8f69cee74a00d336e9262f6b883e710b7664e1097495aba9401a830ea
font_02_sfnt_off00012e51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E51 10292 bytes
SHA-256: a133c5ea5d23b0ae19670872ca62d56182633ff7411707c13c4f0afbba45249b

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