Malicious PDF — malware analysis report

Static analysis result for SHA-256 221dcb4de3bd46f4…

MALICIOUS

PDF

82.3 KB Created: 2021-09-19 05:09:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d6e9e6fc6b8b491ebd67ea5bee67462d SHA-1: 98925e09b3d22b13cf5d705c042ca54cbaea47d6 SHA-256: 221dcb4de3bd46f4edcdd1c9a9404e950b37aa95968fb2de27e1a897ffe8485a
196 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier. A critical heuristic indicates a 'Clipboard command execution lure,' suggesting the document instructs users to copy and paste content into a shell. This is a common technique to bypass security measures and execute malicious commands, likely leading to the download and execution of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://www.bakkersvlaanderen.be/resources/plugins/ckfinder/userfiles/0/files/51141566280.pdf In PDF document text
    • http://alrabbancapital.com/file/files/23880104567.pdfIn PDF document text
    • http://csc0516.com/userfiles/file/20210901105237_0prs5t.pdfIn PDF document text
    • http://aromamahabaleshwar.com/ckfinder/userfiles/files/28314648473.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f94c0c25e8---nasogiravexulo.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/e4f341kd5tjpmiesm29r84a948/moduxiluritosatoka.pdfIn PDF document text
    • http://dagmare.de/userfiles/file/numelojisad.pdfIn PDF document text
    • http://boletin.alicantehosteleria.com/lib/ckfinder/userfiles/files/2275059378.pdfIn PDF document text
    • https://mamap.in/ci/userfiles/files/3648289714.pdfIn PDF document text
    • http://telecycling.org/files/file/44774643027.pdfIn PDF document text
    • http://inbiosa.eu/static/cfiles/files/lepiwuxopukug.pdfIn PDF document text
    • http://elementyzlaczne.pl/media/file/53349389098.pdfIn PDF document text
    • http://www.gleason.com.au/application/third_party/ckfinder/userfiles/files/kemil.pdfIn PDF document text
    • https://shellserva.nl/docs/Image/file/55049799327.pdfIn PDF document text
    • http://ericshartman.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kimovasok.pdfIn PDF document text
    • http://chenruichem.com/upload/files/giwokifonewoxu.pdfIn PDF document text
    • https://phatgiaolongan.com/upload/ckupload/files/98658666745.pdfIn PDF document text
    • http://chinahk-ip.com/chinahk_ip/html/files/editor/file/rofodalujoganujesezi.pdfIn PDF document text
    • https://verner.lt/images/files/wuleginu.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16140be59ddf6d---18829677810.pdfIn PDF document text
    • https://yingzhaoliuart.com/upload/file/41938267324.pdfIn PDF document text
    • http://vuoncotichdep.com/upload/files/vifevulazilifomon.pdfIn PDF document text
    • http://aqs-group.it/userfiles/files/bufifewuwemuf.pdfIn PDF document text
    • https://hometutorsdelhi.com/userfiles/files/ruvolubet.pdfIn PDF document text
    • http://auksozvynas.lt/userfiles/file/93417756459.pdfIn PDF document text
    • http://coral-travel66.ru/admin/ckfinder/userfiles/files/kebof.pdfIn PDF document text
    • http://ukonlinedirect.com/userfiles/files/24166671351.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=restore+bookmarks+chrome+androidPDF link annotation
    • http://cluster006.ovh.net/~greeters/namur/ckfinder/userfiles/files/92456546104.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_off0000dd4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD4E 10864 bytes
SHA-256: 3e7513c1dcf0e67fde05d16567b437d21ce9150b02f92ac3328e1f20f0302de4
font_01_sfnt_off0000f641.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF641 17244 bytes
SHA-256: 16583fb2ac66dbe6421667d598c22caed19536b147309cb49f34423671a835d1
font_02_sfnt_off000122d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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