Malicious PDF — malware analysis report

Static analysis result for SHA-256 7994d074341d7262…

MALICIOUS

PDF

80.9 KB Created: 2021-09-16 10:09:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 38f58d2fbcc1f277259cfb46abe38f2e SHA-1: f41b140bdd6216e9b6567f2022914681b39d29ba SHA-256: 7994d074341d7262b702c79c1904f671e006e3077fdf231d4073a167ded66b0a
216 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The 'SE_CLIPBOARD_COMMAND_LURE' heuristic indicates the document instructs the user to paste content into a command-line interface, a common tactic for executing malicious commands. While no scripts were directly extracted, the ML classifier and ClamAV detection strongly suggest malicious intent, likely involving the download and execution of a secondary payload via the described command-line lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 8

  • PRC/3D content in PDF medium CVE related PDF_PRC_3D
    PDF contains PRC 3D content. PRC/U3D parsers have been a recurring Adobe Reader attack surface; treat as a related parser-exploit indicator rather than a specific CVE match.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://szentdorottyapatika.hu/files/godojezovifumemeles.pdf In PDF document text
    • https://rh-h1tapi-turbo.com/contents/files/tobitugewemedoxovozibubij.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-9-13/20210913191052432020.pdfIn PDF document text
    • http://moonlightmontessori.com/upload/files/rewuruvubisugumikeke.pdfIn PDF document text
    • http://bellamy.tw/uploads/files/202109061520423589.pdfIn PDF document text
    • https://www.oalysa.cz/ckfinder/userfiles/files/menofomabesati.pdfIn PDF document text
    • http://domoticasociale.it/immaginiNewsletter/file/xilugalibomoxirujuj.pdfIn PDF document text
    • http://lamarchesainterita.be/lamarchesainterita/imgdb/news/files/jasukajogam.pdfIn PDF document text
    • http://etalentlink.com/uploadfile/file///2021091603232676.pdfIn PDF document text
    • http://healingtown.org/userData/board/file/75324662689.pdfIn PDF document text
    • http://huichem.com/ckfinder/userfiles/files/58844687973.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/c02e8f256c3f4213a558abf5ccac1518/vodagasasazep.pdfIn PDF document text
    • https://ichapps.com/ichapps/ckeditor-ckfinder-integration/uploads/files/zodofojimobulepafalewixug.pdfIn PDF document text
    • http://swiftnb.com/ckfinder/userfiles/files/99092616986.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613103f5e9d73---15592099435.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/xerebilumekaxebodav.pdfIn PDF document text
    • https://aarhuskortet.dk/images/file/lepizidetisijokarexinej.pdfIn PDF document text
    • https://tatsolarlight.com/uploads/files/59945536046.pdfIn PDF document text
    • http://argol-editions.fr/userfiles/file/xanapexukegifavex.pdfIn PDF document text
    • https://leanuslab.com/UserFiles/file/beritewijoz.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d73fb901cf---68191206201.pdfIn PDF document text
    • https://suacuacuontoanphat.com/upload/files/juzelajiniroxodepi.pdfIn PDF document text
    • https://foodexgida.com/uploads/files/71210170597.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=solve+function+for+x+calculatorPDF 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_off0000da32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA32 10504 bytes
SHA-256: 7a97cd11a4dbf9daf4649084c54531d19bfdcbda25ae06358c7666ba1d7fc63e
font_01_sfnt_off0000f249.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF249 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A5B 16628 bytes
SHA-256: dc66f1b0590682fc78c2cf30e6b0079698296944bfdaa1bae98da2478e7585d9

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