Malicious PDF — malware analysis report

Static analysis result for SHA-256 96b3ffc7705260a4…

MALICIOUS

PDF

85.3 KB Created: 2021-07-01 10:00:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5d6e08823ebd84873267dc60380bdece SHA-1: 2d55abf798dcbd8dcf4a1680b5a8f623bf0fe55e SHA-256: 96b3ffc7705260a40be8ea4dfb71cf952d10540521932ad798c5b05b3d4d23ee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external links, many hosted on compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The PDF structure and embedded URLs point towards an attempt to lure users to external sites for potential credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://coretry.ru/uplcv?utm_term=need+to+do+synonym PDF link annotation
    • http://pumarecovery.com/userfiles/files/8269712586.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160b1f861cb5c0---xuzivesin.pdfIn PDF document text
    • http://zoltysnieg.pl/pliki_wyswig/files/44722259506.pdfIn PDF document text
    • https://serwisnawigacji.pl/userfiles/file/41753604608.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/d724686db75624fac7d075e359eb0e41/kafepagumabuduvofu.pdfIn PDF document text
    • http://lmyc.net/clients/875386/File/fagit.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/4p43lkf54ii1uj0m7tg0gefs7d/93483329741.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160a121b19f1b8---13151606555.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/e5m52il1l1turld5vmegs46jlu/jebutizasipidopure.pdfIn PDF document text
    • http://sbnjl.com/userfiles/files/78110355651.pdfIn PDF document text
    • http://thinhhoanggia.vn/Images_upload/files/povov.pdfIn PDF document text
    • https://aterhesseg.com/up_image/file/fokumivawevuzomewof.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/m14dn2mafiohf2p2hk142v6mh3/japebij.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/4lk3vkp7er9emlrflkk86vip35/wasunibifuzuzekowu.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609ea224e8a69---lagaledonarojuvejex.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077be8e9ac2b---zikadefojatuxavotup.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/36077984385.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/e591c50f6d15e02588fdf59d1677a42e/34725930135.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/800cc7e5f4c31cb8dbbfe0dc4faaa8cf/6453904472.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/ee0e2413abf321628b702e1e0439c8e6/xotivatotoja.pdfIn PDF document text
    • http://3suntech.com/UploadFile/file/20210619090710950.pdfIn PDF document text
    • http://rhondachem.com/d/files/tefetovufokani.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf32423711---57415644543.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16095abb45a6f8---41993271871.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_off0000ed2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001053c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1053C 17140 bytes
SHA-256: 442dc9d2d7a45fa42584bf0acc7c83f2f7e026cec961edf07f8ccd366ebff4c9
font_02_sfnt_off000131aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131AA 10100 bytes
SHA-256: 6806fbcb6c1975703120f5961877697516a9ad3d0a12a83bfd94de78da0a517b

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