Malicious PDF — malware analysis report

Static analysis result for SHA-256 1aff80c39d649491…

MALICIOUS

PDF

85.1 KB Created: 2021-08-24 23:44:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0ee4ae3b2b5c54873404d2cb5a60c7dd SHA-1: 618f53e009ef8a4a7fc3180e699d53b7f7a2f24f SHA-256: 1aff80c39d6494919e01c2666f0fb342820de0702a189f78e8e9a30c6e96e189
204 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and exhibits characteristics of a link farm, with many URLs pointing to potentially compromised sites. Notably, it includes a lure for clipboard command execution, instructing the user to paste content into a shell, which is a common technique for delivering second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://bawwabatrizq.com/userfiles/file/10808546143.pdf In PDF document text
    • https://castilloexterior.net/ckfinder/userfiles/files/zopefomodojenede.pdfIn PDF document text
    • https://butagallery.com/userfiles/files/69314427755.pdfIn PDF document text
    • http://www.donboscovizag.org/images/files/17356505460.pdfIn PDF document text
    • http://xn--80affcyoc0ac1f6a.xn--p1ai/admin/modules/ckeditor/ckfinder/userfiles/files/43807086077.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/16287153193914.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/bpnnq9lve5ll1h6kdjtho5p0mj/6062333717.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607258ea6b0ac---69775232712.pdfIn PDF document text
    • https://liepasmuiza.lv/userfiles/library/vuperitizubitega.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16112dad8638ed---16837625043.pdfIn PDF document text
    • http://suchanekstomatolog.pl/files/file/88405518464.pdfIn PDF document text
    • https://qnzar.com/files/68565457911.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16076e7809a019---jawugekutukikiwupo.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16076a15c7cf64---zixozodew.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c368f56a2c3---79093314949.pdfIn PDF document text
    • https://marblobathware.ph/app/webroot/img/files/46466274751.pdfIn PDF document text
    • https://calmoinc.com/upload/editor/file/23082766499.pdfIn PDF document text
    • http://thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/deliperofugevof.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/th9liv4aoamd9k7eljupeiphh0/noxiveme.pdfIn PDF document text
    • https://coimbatorepressclub.com/FCKeditor/userfiles/file/baximuzika.pdfIn PDF document text
    • http://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tamafanonorirukemamozazi.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/f332df50757f69b716023178826af29e/xamuboketuxozubozofe.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611acad5ceb63---xoxupumobuvuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=linux+repeat+commandPDF link annotation
    • 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_off0000e4b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B4 10620 bytes
SHA-256: 67e2ddfcf49a585f13827db0be414ebd83abd934826ae2b48c26e1bedcff03d4
font_01_sfnt_off0000fcf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001150b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1150B 18824 bytes
SHA-256: d98d577a16dc4d9923fe7babed1c2071a11c4134521dd52f6fb366395a3acac7

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