Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b63ffa5d08b2a18…

MALICIOUS

PDF

85.3 KB Created: 2021-09-10 09:06:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: d42bb6165ef8a104339952d8b6f01cde SHA-1: 582e0322116ae7736bb245bbcd8c58f6ddb0e921 SHA-256: 9b63ffa5d08b2a18ada9d4cbf9bbe17907ae806fb6e86d61cc95db7c29367950
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various domains, some of which are hosted on compromised WordPress sites. The presence of 'utm_term' parameters in some URLs suggests a phishing or spam campaign aimed at driving traffic to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://irlanc.ru/uplcv?utm_term=payg+nokia+lumia+520 PDF link annotation
    • http://tecs4.com/intranet/ckfinder/userfiles/files/41477891721.pdfIn PDF document text
    • https://cartolmania.it/file/bajebuvoxebomajabaxifef.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/abd9dd29c08d845549c30b3fbba57b02/58708719307.pdfIn PDF document text
    • https://paron-rebondir.com/uploads/files/26650045075.pdfIn PDF document text
    • http://xn----7sbicwad4afgcgd5aph7d5e.xn--p1ai/ckfinder/userfiles/files/zilixogavune.pdfIn PDF document text
    • https://sharmtocairo.com/userfiles/files/xowosumemif.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16134504639d7b---digegab.pdfIn PDF document text
    • https://rugerwafers.com/demo/ruger/beta/userfiles/files/lunimololapoduvasoduvaxu.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/36874807507.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/refapetatoze.pdfIn PDF document text
    • http://scales-center.com/shop/fck_file/file/wenevaz.pdfIn PDF document text
    • http://aranysolyomfeszke.hu/editor_up/kilovon.pdfIn PDF document text
    • https://mollis.rs/files/xodivafiwuledopakuvalaxe.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/dezidivowen.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133f47a85e6d---41635189869.pdfIn PDF document text
    • http://ckattorneys.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/34856477965.pdfIn PDF document text
    • http://servmed.net/userfiles/file/10589893078.pdfIn PDF document text
    • https://lexcochoralsoc.org/demo/lccs/beta/userfiles/files/75530113433.pdfIn PDF document text
    • https://shevtsov-art.com/uploads/files/13375806353.pdfIn PDF document text
    • https://pingthye.com/userfiles/files/97665999963.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/q4t936gk4b9crskbgcfgdr6uc0/gasobifezulomutup.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/kogigalemanugoruzuxoso.pdfIn PDF document text
    • https://qatarsecurityservices.com/public_html/userfiles/file/9576945384.pdfIn PDF document text
    • http://www.depomatrial.com/file/49837024258.pdfIn PDF document text
    • http://aotem.com/data/home/qxu1780220113/htdocs/uploadfile/files/molusufejinuxikibo.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161381b6d39532---fikufuje.pdfIn PDF document text
    • http://verypool.cn/images/upload/File/mofusofusibugetu.pdfIn PDF document text
    • https://ises.smithpressautomation.com/phpsites/vertical_living/uploads/file/tiliwewulujo.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_off0000e692.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE692 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fea4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA4 18192 bytes
SHA-256: 0cc35fa11cb42a1b944ecf6e61657362c4d178b6f8614306e5d6e7581bdd6b28
font_02_sfnt_off00012e12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E12 10636 bytes
SHA-256: 2f484d1a8bad3bf2d414acdfeddf956a7c3dd1fa55a37f2bf731d34e328fe36b

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