Malicious PDF — malware analysis report

Static analysis result for SHA-256 f02f3973f9f15419…

MALICIOUS

PDF

82.3 KB Created: 2021-09-13 08:25:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 3eef3327510b9bc2f6692a164cda2e70 SHA-1: 339b14e926a24539ac8ec988df65a6d9c7077efb SHA-256: f02f3973f9f15419e65c5d765bdae75968769b28828029ca05a106b5c57edf5b
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to a variety of domains, many of which appear to be compromised or disposable hosting. Heuristics indicate a 'link farm' strategy, a common tactic for phishing or distributing further malware. 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 0.9846

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://allytemp.ru/uplcv?utm_term=browser+like+tor+for+android PDF link annotation
    • https://ducthai.vn/userfiles/file/78996893302.pdfIn PDF document text
    • https://www.creativetalentnetwork.com/ckfinder/userfiles/files/rodemagujanotegaboton.pdfIn PDF document text
    • https://nedimgame.net/calisma2/files/uploads/busitav.pdfIn PDF document text
    • http://ausafe.net/images/art/files/68544877284.pdfIn PDF document text
    • https://birutelorasin.com/contents/files/pifagin.pdfIn PDF document text
    • https://perfecthospital.net/FCKeditor/file/52583986379.pdfIn PDF document text
    • http://clinical-pain.com/pds/userfiles/files/bujowomilaz.pdfIn PDF document text
    • https://truckforceone.eu/upload/editor/file/99621464428.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab653ef82d---peturesamafuzirudet.pdfIn PDF document text
    • http://support-cmu.com/filedata/file/61132806915.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613e3ab99cc2d---85521038815.pdfIn PDF document text
    • http://dienlanhhuubinh.com/upload/files/jumadavewiwet.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1eae768dd---44185995654.pdfIn PDF document text
    • http://yourmoneyyourbank.com/uploads/File/98821573679.pdfIn PDF document text
    • http://jcon-aps.dk/userfiles/file/vefepake.pdfIn PDF document text
    • http://myhomeinparis.com/userfiles/files/60829796166.pdfIn PDF document text
    • http://yourbuilding.ru/userfiles/files/dabovirafaletatevu.pdfIn PDF document text
    • http://karthikeyanjayaram.com/userfiles/file/xusijexazalamera.pdfIn PDF document text
    • http://karimeh.com/public/userfiles/file/lelubutubewulutebotavix.pdfIn PDF document text
    • http://alphamarino.kz/images/news/file/33006432143.pdfIn PDF document text
    • https://stancijanegrin.com/UserFiles/files/vojovolexogukajemisomipev.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/nefisuropabibikuvibaz.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/a4b1sh4lrdonrqbtqm2leto1d5/58874783213.pdfIn PDF document text
    • https://krzczonowice.pl/gfx/file/wumarawejuluzafapeweti.pdfIn PDF document text
    • http://amblesidewindermere.ca/fckuploads/images/file/tarutugegavatabobisuwusow.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fa8472ba61---nofinasilegeboxuk.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_off0000deb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB6 17164 bytes
SHA-256: 5857a13752ec518b8b2027d8b17f2f71ace93c34a12ac2f483ea3fb13570ed69
font_01_sfnt_off00010b73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B73 10580 bytes
SHA-256: 809f3260fc99cadce0beb8c3a652676d31c97cba22c2c353512331e0e41a9de9
font_02_sfnt_off000123d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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