Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f61d4088376a01f…

MALICIOUS

PDF

86.3 KB Created: 2021-09-01 11:38:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c7c728e0d2086e7a77548672e80af6d9 SHA-1: 9fb4f975e2f6e4dc95f8e88735b0303b76c77abc SHA-256: 5f61d4088376a01ff8dac31c308a9492bab489fd3204bc41d7fdde7b791ec6e2
164 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate it functions as a link farm, directing users to multiple compromised websites, some hosted on WordPress upload storage. The presence of urgency lures suggests a phishing or social engineering tactic to encourage user interaction with these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608466c5a069e---xoreteredejabar.pdf In PDF document text
    • http://hanasushichoice.com/uploads/files/fonexakojitokipudigoxal.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16098a03d1ecfe---jufakuxul.pdfIn PDF document text
    • https://travelworld.ro/userfiles/file/dezokelasitotutat.pdfIn PDF document text
    • http://malifer.hu/upload/file/29690424818.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/3283fb5d6af08aca72617d8bd4d0bd23/83482837497.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a630c725d02---tuwejasozinove.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/t6lnm1ut397kqnph9e58h80001/mujolivawozewupitebos.pdfIn PDF document text
    • http://wooshin.kr/uploaded/file/59242584060e0fa1600cf3.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/8803469888.pdfIn PDF document text
    • https://www.milestonesmn.org/ckfinder/userfiles/files/50850998856.pdfIn PDF document text
    • http://selmanoglusigorta.com/userfiles/file/51728393348.pdfIn PDF document text
    • http://lg-palette.com/upload/files/sexakekata.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/80099534655.pdfIn PDF document text
    • http://cadelupo.it/userfiles/files/fetozoluvomejiw.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a725a71d929---53161452418.pdfIn PDF document text
    • http://www.mousumibanerjee.com/fckimages/file/fobirekabimivevolesa.pdfIn PDF document text
    • http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/baxamimonapolululedodub.pdfIn PDF document text
    • http://www.majbrno.cz/uploads/files/soraduwubokugawewivu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=10+quiz+questions+with+answersPDF 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_off0000ebe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000103f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F7 17872 bytes
SHA-256: ffa9ada062ce64f873a04fb3bd0da7d857e9836c821eb15445db0f8541a88752
font_02_sfnt_off000132a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132A8 10628 bytes
SHA-256: 546674f707d7be05bf53da984b72d3eac19dc31e9d87533c3aaa62b19336b5a5

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