Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b02261fa4f1923c…

MALICIOUS

PDF

88.8 KB Created: 2021-08-04 08:06:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 12b7b42dedb9c88898133a5d4aa313f6 SHA-1: 995f87c8008cc52df2925009348464568e898bda SHA-256: 7b02261fa4f1923ca0de467a296d9202b12c7e96e024704724fc8161b5eb141b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains multiple links to external websites, many of which are hosted on compromised CMS platforms, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/5fcfe9ec41c53b45706e31b4d99342c2/bezofisodapizere.pdf In PDF document text
    • http://aisef.org/uploads/userfiles/file/file/biles.pdfIn PDF document text
    • http://auksozvynas.lt/userfiles/file/25663974233.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/dogepovi.pdfIn PDF document text
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609016114cd0d---wesedutuwemebuvuw.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608615c689299---tefolinikis.pdfIn PDF document text
    • https://santaclara.com/wysiwygfiles/file/rudibave.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160cf697eb4604---ropasimipe.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c594f0c75c6---vapunogemesofedimoxetada.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2be3c96e34---12592980785.pdfIn PDF document text
    • http://citescolairedeledit.com/include/file/duxorukox.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16071f61c54224---xaguwo.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607783f53abf7---81900476319.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/h0vgrkd84i8k602pvurt1sfke4/wadawakizero.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9317e2d1f---mevujetoreruguxuwuwoxo.pdfIn PDF document text
    • https://tsafar.ir/basefile/tsafarir/files/86848670535.pdfIn PDF document text
    • http://mckeoughfamilyreunion2021.com/clients/b/ba/baf9e6b347377fae0abe5a87436fc4cf/File/legilasotazom.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16083278a208ef---12430129477.pdfIn PDF document text
    • http://idealhca.com/admin/images/file/xotebufamu.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/d32a89196f2e82d6ce2eb65bef52bea7/63000984749.pdfIn PDF document text
    • http://apnorajasthan.net/userfiles/file/jikajurisowofikupupof.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/dunojasiru.pdfIn PDF document text
    • http://collegium-connect.nl/ckupload/files/45991901582.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/acf14f825c2f0085941006a3f2dff6db/45451609619.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/35901406289.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/ac440966c9a5eab6ab6fd45215ea6b96/dizavekonuxag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=uc+browser+fast+download+app+free+downloadPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f86c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF86C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011083.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11083 10752 bytes
SHA-256: b095abd8de0af36ea8115426d041d6fe635f7233fcf4015e07c75f2232b77b7d
font_02_sfnt_off0001293a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1293A 16644 bytes
SHA-256: 6b8d16ceb95368ce22f0973b50169a392034e1390a359ee332c9339640f3b30b