Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf7ae1744bc16293…

MALICIOUS

PDF

87.1 KB Created: 2021-09-16 17:57:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d7b3b3ffd3defdb15bf292a0af60fac6 SHA-1: 8fbcc6da6c01a577146e26d8414660ab4aaccceb SHA-256: bf7ae1744bc1629339883a058aafd4e97766e2e6bc713a8e4dc6a500b144ff90
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of link farming, suggesting the document's primary purpose is to redirect users to external sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://inwebjor.ru/uplcv?utm_term=free+20+likes+on+instagram PDF link annotation
    • http://madiagranitosilano.it/userfiles/files/relirufiwaxebidup.pdfIn PDF document text
    • https://livres-d-art.com/ckfinder/userfiles/files/batokosefunexunamokajagos.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/foo6tsco4r6apbfci33m17plk1/87201273272.pdfIn PDF document text
    • http://xinyaoqiye.com/upload_fck/file/2021-9-6/20210906041858669653.pdfIn PDF document text
    • https://elminhaj.org/userfiles/file/garukuxinoledinaxul.pdfIn PDF document text
    • http://lamarchesainterita.be/lamarchesainterita/imgdb/news/files/20690381644.pdfIn PDF document text
    • http://9y.bfage.com/upload/files/20210916055245.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013new/admindia/ckfinder/userfiles/files/jeduxigibowo.pdfIn PDF document text
    • https://cihangirhotel.com/upload/ckfinder/files/41675250088.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/dav2fnsfqdjgcvoknc5jluhgp0/gulipimedewex.pdfIn PDF document text
    • https://volandovia.it/public/fileeditor/file/rinakibujiduroziboliruvaz.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/xomusamebuxafunomafoji.pdfIn PDF document text
    • http://abwlanham.com/uploads/files/limutagagefuxi.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/tuludoweruvono.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/f666b65115b91a674cb7fb96df11e1df/wafenojorojowemekuwuga.pdfIn PDF document text
    • https://evrenmentese.com/upload/ckfinder/files/xopakogovusejumanodoneto.pdfIn PDF document text
    • https://novamakine.com/upload/ckfinder/files/7701463156.pdfIn PDF document text
    • http://xn--80aaaaaikdebj9ccf1ayja1b5a3q.xn--p1ai/ckfinder/userfiles/files/11741895953.pdfIn PDF document text
    • https://hgb.se/filer/file/jobenonemi.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1613f3a4dbe8ee---xagowa.pdfIn PDF document text
    • http://image.dlib.vn/libedu/news/bvu/20210916/file/gukegebebowenibamej.pdfIn PDF document text
    • https://jdrum-music.com/uploads/ckfiles/files/vomulosegisoguvovegofeb.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/81804109493.pdfIn PDF document text
    • http://saddabro.com/userfiles/file/4293787844.pdfIn PDF document text
    • http://topnotchimports.com/ckfinder/userfiles/files/turovivaderut.pdfIn PDF document text
    • http://ckattorneys.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bujutimered.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_off0000ebc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC5 10760 bytes
SHA-256: 1175ed837481ec1711d36f94e065da5a4cae4c037b74907a785f8deabb3693c4
font_01_sfnt_off0001048c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1048C 19196 bytes
SHA-256: bd4ef6432afd704ab4b4d632320d203208c4ef982b85993a43e678a17bde5bc8
font_02_sfnt_off000136b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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