Malicious PDF — malware analysis report

Static analysis result for SHA-256 67c9382f48814cb6…

MALICIOUS

PDF

74.6 KB Created: 2021-09-18 02:46:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5e816490680d47b93e9ca84f52e86e91 SHA-1: 270d45051e93867dc92ec28c925c068ae23b35d6 SHA-256: 67c9382f48814cb6e0f5049cb14909f47d8d2eae833a16d4a89803ac61ab3eee
196 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV. It contains multiple links to external sites, some of which are hosted on compromised WordPress instances. A critical heuristic indicates the document attempts to trick users into executing commands via clipboard manipulation, a common technique for downloading and executing further stages of an attack. No document body text was extracted, but the heuristics strongly suggest a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://coretry.ru/uplcv?utm_term=private+notepad+apk PDF link annotation
    • https://mosallaesf.ir/uploads/ck/files/wunuzasome.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613faaa1ad4e2---3203343310.pdfIn PDF document text
    • http://iphonedown.com/ckfinder/userfiles/files/sadapijidukikadaboret.pdfIn PDF document text
    • http://www.investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/60471316066.pdfIn PDF document text
    • http://sushibelovo.ru/files/wogezopuxejexofabelokilo.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/tixatanumezabuvibada.pdfIn PDF document text
    • http://doctour.hu/uploads/ckfinder/userfiles/files/27698483160.pdfIn PDF document text
    • http://iproperty.ae/userfiles/file/jaxiv.pdfIn PDF document text
    • http://akwarella.pl/user_uploads/file/jokido.pdfIn PDF document text
    • http://vp-dmsh.ru/admin/ckfinder/userfiles/files/dinabavesem.pdfIn PDF document text
    • http://uptownherndon.com/uploads/files/51192706462.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/fagoguduve.pdfIn PDF document text
    • http://eng.sut.ac.th/tce/2016/administrator/ckfinder/userfiles/files/wabasewanutejopotisij.pdfIn PDF document text
    • http://tasteofruraleurope.eu/upload/File/65063342256.pdfIn PDF document text
    • https://doublehaircenter.com/upload/ckfinder/files/14767578.pdfIn PDF document text
    • http://jkbprivateiti.com/userfiles/file/jowitap.pdfIn PDF document text
    • http://itaxabc.com/userfiles/file/20210914163035_915297054.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1613348659eb44---tomuteven.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/rowuxunavejexi.pdfIn PDF document text
    • https://podereilmontaleo.it/writable/public/userfiles/file/ralobogogiwu.pdfIn PDF document text
    • https://nichecnk.leaddeehub.com/userfiles/files/13861002048.pdfIn PDF document text
    • https://sbmhavacilik.com/userfiles/file/53868736455.pdfIn PDF document text
    • http://hoangminhphatkorea.com/webroot/img/files/barojabatosimo.pdfIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/57e11c6205ba767c55edd5ef55fa688c/80129224472.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_off0000c0c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d8db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8DB 17052 bytes
SHA-256: ebf99b290d170592a544b86c71899d69d081a59904496e7823749b31c5fa94c5
font_02_sfnt_off000104ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104EA 10332 bytes
SHA-256: a989bb56246b35be12c0bacebb28b0f95d9f35caf225d30927c79f57b4391a0c

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