Malicious PDF — malware analysis report

Static analysis result for SHA-256 798eb1406095469c…

MALICIOUS

PDF

88.6 KB Created: 2021-09-10 07:24:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 022fc06d26368056e89962ddfaf9f3eb SHA-1: 8aa5b64f9a262638d9efb1aa2b4846a92d55259a SHA-256: 798eb1406095469c22248b942aa7457cc1dda9b4502e579f67d8121c991ea0ef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which are part of link farms hosted on potentially compromised or disposable domains, suggesting a phishing or scam campaign. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of URLs like 'https://nomylo.ru/uplcv?utm_term=check+private+instagram' strongly suggest a lure to external malicious sites. No scripts were extracted, but the overall structure and URL patterns point to a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 https://nomylo.ru/uplcv?utm_term=check+private+instagram PDF link annotation
    • https://www.sacict.or.th/ckfinder/userfiles/files/93703336324.pdfIn PDF document text
    • https://xn--b8qxb801j.tw/upload/files/fozijobeguduwadipezufi.pdfIn PDF document text
    • https://vinocastillo.hu/editor_up/gomagi.pdfIn PDF document text
    • http://fermobkorea.com/userfiles/file/20210902000307.pdfIn PDF document text
    • http://emanuelmlevin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/16135137842.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/67237491164.pdfIn PDF document text
    • http://pribatu.lamilagrosaimport.com/images/files/rorubewumexibula.pdfIn PDF document text
    • http://ramenhajimetustin.com/uploads/files/15194100607.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/ae1ba74b82f422bf5a0f277c263f0e48/tevozumowunubivezofunika.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136c265e5c9a---57399358086.pdfIn PDF document text
    • http://mondoacquapiscine.com/userfiles/files/budusasefafeguro.pdfIn PDF document text
    • https://mygoaltv.org/ipp/images/uploads/files/soxelasetivitif.pdfIn PDF document text
    • https://pabxlg.com/userfiles/file/89979156357.pdfIn PDF document text
    • https://www.potravinyav21.cz/ckfinder/userfiles/files/10564053386.pdfIn PDF document text
    • https://kipass.fr/userfiles/file/jagoluwibazutorofe.pdfIn PDF document text
    • https://marblo.com/app/webroot/img/files/62447158214.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/jotevonevigesoditewasatef.pdfIn PDF document text
    • http://rkmaster.ru/uploads/files/puxakarolip.pdfIn PDF document text
    • http://mintaialuminum.com/d/files/zufewaxemiwirafigifa.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/23737686090.pdfIn PDF document text
    • http://seattlebestteriyaki.com/uploads/files/97874257488.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/tumotesapekezazaxixozebo.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/k1894q38i3afeh41vu9lgah2l6/32606592420.pdfIn PDF document text
    • http://aotwresort.net/ckfinder/userfiles/files/gefejorifosenobowul.pdfIn PDF document text
    • http://ideviceplus.nl/app/webroot/files/userfiles/files/44029861611.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/40luml1kejb8m54ho9e6mfja8d/66539762907.pdfIn PDF document text
    • http://word.mn/uploads/assets/wopew.pdfIn PDF document text
    • https://lexcyberia.com/userfiles/files/venikesovofosito.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_off0000f4ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4ED 10844 bytes
SHA-256: c0783b9d9543e3f03b1cd792822886f5a675cda6d79f8844bb91867c281c0c5f
font_01_sfnt_off00010ddd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DDD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000125ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125EF 18244 bytes
SHA-256: 3b02827b84c9545f4679555a11e4cca8680b30cda85e1643692fe5d171f528da

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