Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3990743282bb980…

MALICIOUS

PDF

71.7 KB Created: 2021-09-12 20:48:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 32fefe2c72b3cb06a404bab37c8a4d81 SHA-1: c94b7f61a8c79aa3fa48e90dc13c5e5807922524 SHA-256: b3990743282bb9807f4de66cfc4580bb9c32d8dc068c9a5744276320ac107e04
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a LOLBin command-execution lure. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://garglob.ru/uplcv?utm_term=pubg+lite+super+vpn PDF link annotation
    • http://hanilkwanla.com/uploads/files/mizifosital.pdfIn PDF document text
    • http://griesvoegwerken.nl/UserFiles/file/loditopixe.pdfIn PDF document text
    • http://thewhitmerlawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/33472540950.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/l417blnnnlckt7b7vbgbi6etke/potavat.pdfIn PDF document text
    • http://esenkardeslerinsaat.com/resimlerfiles/fegabakama.pdfIn PDF document text
    • http://sd-admin.fazendapenaazul.com/ckeditor/uploads/files/naxukelutakejunabitez.pdfIn PDF document text
    • https://uslugiinzynierskie.eu/eurostyl/photos/file/rusebuwide.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/pezakuzenowolasiwolag.pdfIn PDF document text
    • http://jiin-torng.com/uploadfiles/20210908072339.pdfIn PDF document text
    • http://hzyixiangchem.com/upload/files/16690706627.pdfIn PDF document text
    • https://dadrarad.ro/userfiles/file/83603326698.pdfIn PDF document text
    • https://www.sesc-am.com.br/Selecao/ckfinder/files/xetizudokewezemezoluz.pdfIn PDF document text
    • http://beamstraffic.ae/amb/userfiles/file/98257437024.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16130ec874e444---48998182216.pdfIn PDF document text
    • http://shiokuda1.com/contents/files/11105895225.pdfIn PDF document text
    • http://hotelclinton.it/userfiles/files/94813117000.pdfIn PDF document text
    • https://sportsht.com/userfiles/file/mejajakub.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135ae76b7b36---renileloz.pdfIn PDF document text
    • http://biogenetec.tw/image/files/20210905_073101.pdfIn PDF document text
    • http://qdcmd.com/data/files/buwiwidedibozizigalu.pdfIn PDF document text
    • https://megashina24.ru/files/files/73983049491.pdfIn PDF document text
    • http://gamebonda.com/ckupload/files/53658182561.pdfIn macro / runtime command snippet
    • http://malovanesklomh.cz/images/file/16941422603.pdfIn macro / runtime command snippet
    • http://ombs.ru/uploads/files/5413574446.pdfIn PDF document text
    • http://panda-es.tokyo/yamituki-n/uploads/files/98592368455.pdfIn PDF document text
    • https://megashinIn macro / runtime command snippet
    • 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_off0000b825.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB825 16360 bytes
SHA-256: ed3b9ee7e92a8a8042a0217e7c28f3ffb58be92abb1a4499841d75f870d8fb44
font_01_sfnt_off0000e18a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE18A 10452 bytes
SHA-256: 76a9019ec117814b1a9b002ba6749802e6a59b7363307fe366323a7ad7b22ce1
font_02_sfnt_off0000f929.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF929 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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