Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ba07acc5890dbc6…

MALICIOUS

PDF

98.1 KB Created: 2021-06-25 21:37:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: a9e66061d213da4e06c83e09f222e41a SHA-1: 05ed6b47e84982952b1c27b1127a149ee5d8ebde SHA-256: 8ba07acc5890dbc67cf555de3c789ab1bf99d89636a57c4dedcdc2cd3f4d2f60
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the link farm behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9681

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://asustainable.com/global/file/78003665970.pdf In PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/36d91f2c5d82cb9797ee1c6205595f4f/rovokevikivikeno.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/e7b585447f71f11f506ebe4a2f3ac563/98677886640.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16072881e18ee5---67173860434.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae5f2fd8d1d---gizoj.pdfIn PDF document text
    • http://digemnd.com/UserFiles/file/32908312665.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608466dc53ad7---dijigamutomorutifavuf.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/mavirosuxanafezuwajam.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/p0j6gs1tg7md71jvsa9l3ht3nm/25520082230.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/2fb49780e8eebceb4f9a7789117ab9d2/81295519008.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c35f2a3f14b---84655428525.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/f94a2233c6e949de6408784fd54dec23/10690769284.pdfIn PDF document text
    • http://xiaohecollege.com/d/files/72237147916.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/getekikikoxaligumijir.pdfIn PDF document text
    • http://apartamentosalbatros.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6f1f6a3ee5---nafibi.pdfIn PDF document text
    • http://eksan-ltd.com/userfiles/file/redaf.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16097cc426999f---zuwesinexusazoku.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4ad2711f33---rolakudibotek.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160a631ef6a4d4---96534120940.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/4gsb1nrvaoalp0kgseosnq9dss/54722803814.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/ee7dfa1a8d4c994d9f6dea48aee898a7/mibokapoxomuzujiborufab.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b006fe5ba60---larelu.pdfIn PDF document text
    • http://koreanhotpot.com/uploads/files/vetulisizibarutefowinujir.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a2abcb700f---jufoduzeremop.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/1bef02b2f43fc695905cd62a55af5340/xupuzewe.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca1b74d409---kabibugesaw.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/26a3608cd375bc8e8fcb428a085805fc/mewijisip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=dusclops+trick+room+sword+and+shieldPDF 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

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f74d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF74D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010f5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F5A 9408 bytes
SHA-256: 9f976fadd08b5b11df3d0671f49f65926eeab4d2be7e4980e2833a7302298020
font_02_sfnt_off00012f23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F23 11060 bytes
SHA-256: 01dcc6c858726717f3572c7763fd776aea5e95d3ff27045d6b455bcbfa28a378
font_03_sfnt_off000148c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148C3 18100 bytes
SHA-256: d193bd1adda2effe315266bf9665f5b3704dd278991e92f7c051ec29ae7f8e20

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