Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9bca5f66635a21d…

MALICIOUS

PDF

90.4 KB Created: 2021-09-02 08:06:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7e01598fcc8f15acfe80180f298a85cf SHA-1: b49bbab096d39a3e99b6e0018f821a71d40a1661 SHA-256: c9bca5f66635a21dd22c6963d460c6ebcea44bed4a1f9dfbd7891e089a0b9f8c
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous embedded URLs pointing to compromised websites and potentially disposable hosting. These links are likely intended to redirect users to phishing sites or download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 http://ubestsports.com/imager/files/20210718072518.pdf In PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/ad83cbb14cd0976b9d4cae4ac0ede6df/vizifafuleked.pdfIn PDF document text
    • http://handsonmontessoripk.com/userfiles/files/sefimakurolokovomukuliza.pdfIn PDF document text
    • https://taxforce.nl/userfiles/files/gapuziza.pdfIn PDF document text
    • http://hengtaixin.com/HangShun/ckfinder/userfiles/files/6928225306.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16096adb97e63c---24648502578.pdfIn PDF document text
    • http://www.cerel.eu/images/wyswig_images/file/gagabinonolifamapil.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/nkakqjlofojad0k4pm9kk4gi84/monudumekud.pdfIn PDF document text
    • https://tonitomov.com/picture/file/babuxidajejoritudekofot.pdfIn PDF document text
    • https://kipass.fr/userfiles/file/90170031205.pdfIn PDF document text
    • https://hearing-outlet.com/uploads//files/202108092306065933.pdfIn PDF document text
    • http://kunmobile.vn/files/uploaded/20210809/file/kokikiteju.pdfIn PDF document text
    • https://cristalensi.com/public/File/topudexisugiwawo.pdfIn PDF document text
    • http://855solution.com/htdocs/cljr/data/files/repalipitowerupiwudiraji.pdfIn PDF document text
    • http://tokstar.com/_UploadFile/Images/file/70198628291.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/0hpjf3es0722vrcb6oi3hqfpbk/42830796411.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160915dfa1637d---sojuwupavobezekaxogera.pdfIn PDF document text
    • https://asiajitu.com/contents//files/63146174520.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/1aa6183f0b98bce2ce66de4e67399634/xosibevoritapiz.pdfIn PDF document text
    • http://paulbwatkinslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vitikowarepekufokogefas.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abd83945438---22022742503.pdfIn PDF document text
    • http://lacyfamilyunity.com/clients/2/20/203fd950dafdada58ea32e7b96f0d147/File/28962146585.pdfIn PDF document text
    • http://grandp.ru/userfiles/file/wegozagubexenumag.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/36806251760.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=the+plant+kingdom+worksheet+answersPDF 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_off0000fb8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB8B 10980 bytes
SHA-256: 552d5cc94515b19aa5b759cd012ada6e5bb8b6fe4d26d3e0ed858c0118e185c9
font_01_sfnt_off000114b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012cc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CC2 17792 bytes
SHA-256: 297408e6d6133863de90e03effb41a6ecd2583a0f52cbc56f6669ed4ec85f0c4

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