Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a425bb43760055b…

MALICIOUS

PDF

86.9 KB Created: 2021-06-29 00:11:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 25b56b52707c5bff05fb42763f6d3442 SHA-1: 226774848f99711f5b70b9b1f1eef9beed90f5d6 SHA-256: 3a425bb43760055b6081e6754bee1c5818c1cdd17a731a76b60ca3c5618d2ca5
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. The 'SE_PAYMENT_REDIRECT_LURE' heuristic indicates the document's content is designed to trick users into believing there are new or changed bank instructions, a common tactic in business email compromise scams. The numerous extracted URLs, many hosted on compromised WordPress sites, suggest a link farm designed to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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=how+do+i+remove+incognito+from+my+phone
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/hoqeq3ejllo3bra9lkd7dugacd/bokutisowun.pdf
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608b9d1d64f5a---52864558849.pdf
    • https://sardavetri.it/userfiles/file/bufajanevatikozibegenare.pdf
    • http://dochoiotovn.com/uploads/userfiles/file/17365921132.pdf
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/cea5261cf20d096d6ba5d47106440a26/zalaf.pdf
    • https://invest.pl/userfiles/file/gugusaw.pdf
    • https://bikidi.com/UpFiles/WebEditorFiles/file/88549406740.pdf
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/a8deaf8af34d6839d0465b3ef95c8f39/7684169177.pdf
    • http://lutechmed.com/Images_upload/files/ziripure.pdf
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/86d67db0b9cf9257963768b721d384bc/sepemanuvunaj.pdf
    • https://twr1115.net/files/fckeditor/file/74694413756.pdf
    • http://asea-admin.com/_userfiles/file/20210518012423.pdf
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a0db258501f---vipuzuzugefalutugoxesebin.pdf
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/dfp3iebhpkvjkplncgfbp1sd07/bixob.pdf
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160963b19c554d---11846167616.pdf
    • http://svsteinfurth.de/radsportfiles/file/jegikero.pdf
    • http://ahkjt.com/upfile/file/38372108561.pdf
    • http://www.annaleehuber.com/content_files/file/39367815084.pdf
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077d612f01af---2071651953.pdf
    • http://rgn2u.com/userfiles/files/tasolizufajinozib.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608297430df21---durazulufijexevekuponed.pdf
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c2de62efc29---55772372576.pdf
    • https://theelementrama9.com/userfiles/files/42184942236.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef75.bin
b59c4f3382965277e592168d67a8cbd8d4c9cd4b414571e902474b3252866872
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF75 17584 bytes
font_01_sfnt_off00011d4f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D4F 16792 bytes
font_02_sfnt_off00013566.bin
841eba5824e87c3ae1e54abe944e7709fb9f1b488a8b56cf35178eeed8d491a2
pdf-font-stream PDF embedded font (sfnt) at offset 0x13566 10948 bytes