Malicious PDF — malware analysis report

Static analysis result for SHA-256 708725cd25abee5e…

MALICIOUS

PDF

86.7 KB Created: 2021-08-28 22:24:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d82df131309efe56fd8d02a28c859850 SHA-1: 4f63a4b68000c208f99e6354555c197560ede08a SHA-256: 708725cd25abee5e7d1d107c995eb1516b11a9cccc57c3b7dd15e885346e47de
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to compromised websites, likely intended to trick users into downloading a password-protected archive. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document's intent to conceal a payload. ClamAV detection and ML classification confirm its malicious nature, suggesting it's a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9896

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://chiaranannini.com/userfiles/files/xuxezevuzozuzunuje.pdf In PDF document text
    • http://farmina.ru/uploads/files/99121605015.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/3f9acedc91e0e418218811687b30eefc/fujofovusi.pdfIn PDF document text
    • http://avanti-kuhni.ru/upload/files/tapawegomat.pdfIn PDF document text
    • http://chandigarhdatarecovery.com/files/file/71836779165.pdfIn PDF document text
    • https://intrastorg.com/userfiles/file/wusigegusenu.pdfIn PDF document text
    • http://energy-labels.com/userfiles/file/20767756583.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16071720c4db28---20593370791.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/sujusegesawevivasiduret.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/hlvr073c7upde618dffogcdqt0/59972988147.pdfIn PDF document text
    • https://agatanorek.com/files/file/rejowivetok.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/5f68a2cb06a06fe8fafb5bf40a6138bd/39142104016.pdfIn PDF document text
    • http://rgn2u.com/userfiles/files/finizipopaluwomevewexupi.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/8a536abc3ad3345c3f6da265aa2e18ab/64289011510.pdfIn PDF document text
    • http://longvu.vn/Images_upload/files/relef.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e75d1adfe---18902336499.pdfIn PDF document text
    • http://nordicaluminium.ru/userfiles/file/lokamirafavuloni.pdfIn PDF document text
    • http://157.230.241.115/image/upload/File/6938567498.pdfPDF link annotation
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160979ceb41c99---2299159472.pdfIn PDF document text
    • http://tinavaron.com/ckfinder/userfiles/files/worinazepu.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160885e6845b2f---gedirib.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/zisevejeti.pdfIn PDF document text
    • http://turnwealthy.com/ckfinder/userfiles/files/80462951049.pdfIn PDF document text
    • http://okulsanmalatya.com/imgup/file/13505308522.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607259f948c0c.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/kefibavonufugologilorepe.pdfIn PDF document text
    • https://isosklo.cz/uploads/sifosifubixolovuwitil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=caught+my+girlfriend+texting+her+exPDF 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_off0000edfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFE 10860 bytes
SHA-256: 35231ab859d7cc3f754ce9eb3d681eb340e7527a520390b2fea2cde1774bda06
font_01_sfnt_off000106a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A6 17472 bytes
SHA-256: d4e133f5e596fcbbc2dd080e2d9fff1d0f6069653f14a8ccd80e26e8cfd36071
font_02_sfnt_off0001339a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1339A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1