Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe98570b462460cd…

MALICIOUS

PDF

88.6 KB Created: 2021-09-02 16:32:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e0e20434713a7bb3e2ea8adea2f06837 SHA-1: dd6de0a14fb7740c2a0297827442017cb874b56a SHA-256: fe98570b462460cdef2d528d98b945c06a7e418ef5ceda53ea9a2a632d84ef60
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file functions as a link farm, containing numerous URLs that likely lead to phishing sites or further malware downloads. The presence of compromised CMS upload links suggests a technique to host malicious content on seemingly legitimate websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://medvor.ru/uplcv?utm_term=dji+gimbal+osmo+2+manual PDF link annotation
    • https://fenicia.uy/fenicia.com.uy/uploads/files/84685814614.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/98727a428be3d1c7be634bb0055a45a1/jezup.pdfIn PDF document text
    • http://hoangduy.vn/vn/files/21830501020.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/82571743500.pdfIn PDF document text
    • https://ka-base.no/images_content/file/wobisezizesufotipadumiji.pdfIn PDF document text
    • http://logansport1971.com/clients/4/42/424235dfd0fdcd2d3cc2afd1e16bb83e/File/jimuzopu.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160b327fdaca45---zukarubexonom.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/o5l2t0lmhnu7k96bbtkrbidjdb/sakuxararavisuza.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16096bbc2cb4b0---73399896200.pdfIn PDF document text
    • http://autoscuolepintozzi.it/userfiles/files/gazefiriruxijokugojewofu.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/dbc9ad43d015cbfdc20d5da38581cf69/13592841069.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b23fd3092ee---pivop.pdfIn PDF document text
    • https://thinkhigh-tech.com/d/files/26537696247.pdfIn PDF document text
    • https://iphastkala.com/userfiles/file/fawefulo.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/kopuv.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130b2cae893e---34526676893.pdfIn PDF document text
    • http://food-cloud.com/home/food-cloud/www/site//site/data/files/bijanolariwelobonasixu.pdfIn PDF document text
    • http://ongnuocdenhat.com/upload/files/94989977666.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/fa0ba7ee6926e7410042bae0d8cde9d5/14039033305.pdfIn PDF document text
    • http://angerdress.store/ckfinder/userfiles/files/bolujizobaxudikajol.pdfIn PDF document text
    • http://mistral-paints.cz/userfiles/files/7491226504.pdfIn PDF document text
    • https://vishalahospitality.com/ckfinder/userfiles/files/29799145762.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/37774076182.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/52012703498.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_off0000f387.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF387 18880 bytes
SHA-256: bee750f8de6e978dd1c2e5c0df99649714dafd76f45aeff2bb0daf55fdefb76b
font_01_sfnt_off00012471.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12471 10612 bytes
SHA-256: 5bfae6b804b6d154d933b83ceec2a5e3d81f050080be7c47765ef876b01ceea7
font_02_sfnt_off00013ca9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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