Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa2ea758c5638d71…

MALICIOUS

PDF

69.5 KB Created: 2021-09-19 20:10:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7e2943ec0b7d43f20d6113f082e09d2c SHA-1: 1462049cfda0a610d075ca3398294b8c2c0031b2 SHA-256: fa2ea758c5638d710fabbda1cb0588ddda1279407f33f62c973f1c7d54d25aa7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to potentially compromised or disposable hosting. Heuristics indicate it functions as a link farm, with some links leading to PDFs hosted on compromised CMS upload directories. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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=chef+fever+crazy+kitchen+mod+apk PDF link annotation
    • https://namratalakhotia.com/userfiles/files/novekenemuwodimowenavuta.pdfIn PDF document text
    • http://yuanjen.com/ckfinder/userfiles/files/kesowudotamutagemasudedi.pdfIn PDF document text
    • https://pgp-puh.hr/fck_media/file/13511523387.pdfIn PDF document text
    • http://wmc21.com/ckupload/files/galozo.pdfIn PDF document text
    • http://euroambulans.pl/userfiles/file/571594408.pdfIn PDF document text
    • https://aedwea.com/upload/foto/silapixed.pdfIn PDF document text
    • http://soc-in.com/data/media/files/lisasaxalixukuware.pdfIn PDF document text
    • http://ngocvietbungalow.com/upload/files/92593906657.pdfIn PDF document text
    • http://omni-links.com/images/blog/file/47039309678.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/4c290bc6ef8f6b580e8ed15242deeb6f/44059454464.pdfIn PDF document text
    • http://solo-reisen.com/media/images/file/15275554848.pdfIn PDF document text
    • https://zweefvlieg.net/userfiles/file/60025981453.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/0ad114f6f4366fc82390caf96a1c8162/timuvuvimizagosusubati.pdfIn PDF document text
    • http://www.tractortools.cz/ckfinder/userfiles/files/85230503127.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/11beab78502fd3790cd1cd9c49a0093a/62239204082.pdfIn PDF document text
    • http://verynailscm.com/user_img/file/62063408151.pdfIn PDF document text
    • http://hangtatmj.com/userfiles/54199051359.pdfIn PDF document text
    • http://kerekagy.hu/UserFiles/file/defitutukep.pdfIn PDF document text
    • https://stvorki.ru/files/file/16447521064.pdfIn PDF document text
    • http://www.xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/tugepusip.pdfIn PDF document text
    • https://medtek.vn/storage/file/84469120947.pdfIn PDF document text
    • https://coil.hk/upload/files/xixifumu.pdfIn PDF document text
    • http://burragebrothers.net/demo/jolie/beta/userfiles/files/boruvadonuvo.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143ea355a8cc---lapunomelusebozozoten.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-9-6/20210906135357186907.pdfIn PDF document text
    • https://lapdonline.org/file/9633067625.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_off0000b068.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB068 14688 bytes
SHA-256: c49446b0037291f6e05acbc6a87e341518c80d951626e02f5cf5e764fd1009e2
font_01_sfnt_off0000d4c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C7 11036 bytes
SHA-256: 634f9b929c71bac76ed2b62b538c2f3ba14dbe7e28f939c9bd45daf3586b17fb
font_02_sfnt_off0000ee68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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