Malicious PDF — malware analysis report

Static analysis result for SHA-256 86e0ddecd4c37265…

MALICIOUS

PDF

75.8 KB Created: 2021-10-10 10:45:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0e04b0539b48a839665f6527eb7e785d SHA-1: 276ddf33e6721f45c3b4762dcce0dd0177db9119 SHA-256: 86e0ddecd4c372659ae61f75710b66dedca9141c2cb600bc2c750efb2962bac9
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Phishing: Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier. The 'SE_CLIPBOARD_COMMAND_LURE' heuristic indicates the document instructs users to copy/paste into a command-line context, suggesting an attempt to trick users into executing malicious commands. Numerous URLs were extracted, many pointing to compromised WordPress sites or disposable hosting, likely serving as download locations for further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://inwebjor.ru/uplcv?utm_term=linux+rename+all+files PDF link annotation
    • http://tomaszfilipczak.pl/userfiles/file/64393351590.pdfIn PDF document text
    • http://thaymanhinhlaptop.com/userfiles/file/rorenijeziki.pdfIn PDF document text
    • http://bursaceyizgelinlik.com/images_upload/files/65280277040.pdfIn PDF document text
    • http://vanlysecurity.vn/vanly/album/files/48164166787.pdfIn PDF document text
    • https://miguktour.com/FileData/ckfinder/files/20211003_E46791667700023A.pdfIn PDF document text
    • http://ledspectrumthai.com/ckfinder/userfiles/files/fevojikixisokusi.pdfIn PDF document text
    • https://everywheregenes.com/uploadfile/qu26_qu106_com/files/53614216819.pdfIn PDF document text
    • http://lightofislamonair.org/uploads/files/35071780920.pdfIn PDF document text
    • https://dycmc.com/DATA/upload/files/202109202019516143.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1612f9024ab616---76022927949.pdfIn PDF document text
    • http://mindentudor.hu/userfiles/file/3592756230.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613599541b6ee---wakavewufijixidazabaruz.pdfIn PDF document text
    • https://emtracing.net/userfiles/file/nowajedaxijinubujuru.pdfIn PDF document text
    • https://sunrise-photon.com/upfiles/editor/files/74343754580.pdfIn PDF document text
    • https://pcetravel.com/files/file/lekefisofido.pdfIn PDF document text
    • https://fptica.ru/images/file/55840683909.pdfIn PDF document text
    • http://fruitvita.com/files/files/pezijunono.pdfIn PDF document text
    • http://interiorsexpress.biz/dayafter/uploadimages/newsimages/file/71683383740.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/16156956445a61---47215125301.pdfIn PDF document text
    • http://asztalosweb.hu/userfiles/file/77180178961.pdfIn PDF document text
    • https://gad-elhak.com/userfiles/file/zefolazovavabivopu.pdfIn PDF document text
    • http://vicc.huh.hu/UserFiles/File/satopejatuxomenazap.pdfIn PDF document text
    • https://libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/fekarewufaloputagopa.pdfIn PDF document text
    • http://pastadimatteo.com/ckfinder/userfiles/files/45182305588.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/17113354017.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_off0000c500.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC500 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD12 17424 bytes
SHA-256: c997154c9d95566dcf10106942b75bcb5d21fbd0e94b9d9ff6ff83ab2fd2f68f
font_02_sfnt_off00010aa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA4 10316 bytes
SHA-256: f2500a7c382d32fd033ef1d9f1654847405468e6c1d232aabeaca97fef31ae89

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