Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c7c7c507f915f66…

MALICIOUS

PDF

83.7 KB Created: 2021-09-17 22:29:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2d6c70360ecb56c0209ba41c31d4b949 SHA-1: 0dc9642fa6ccf60da189de0e74b3e90a2009c7c7 SHA-256: 9c7c7c507f915f66f76bb99cf4f8c0d35d09d1a1387048d57a161097381b4ce3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to trick users into downloading malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the overall structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://queure.ru/uplcv?utm_term=sending+resume+to+friend+for+referral PDF link annotation
    • http://ues-rb.ru/themes/ues-rb.ru/files/budufinexagakinu.pdfIn PDF document text
    • https://dispecom.com/cms_dispecom/sgi_userfiles/userfiles/files/fulirewavetorun.pdfIn PDF document text
    • http://yetisirkaucuk.com/firma/files/takigajabu.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/6bbb8ec5051b5ca0aea9e9e91a479b54/75080451366.pdfIn PDF document text
    • http://meyanko.com/userfiles/file///xefefirolixoxat.pdfIn PDF document text
    • https://ovistar-dz.com/ckfinder/userfiles/files/53881228292.pdfIn PDF document text
    • https://luatkhangthai.vn/upload/fck/file/42615464030.pdfIn PDF document text
    • http://floridadressyourhome.com/uploaded_files/userfiles/files/wuvole.pdfIn PDF document text
    • http://stattus.com/assets/file/80631209715.pdfIn PDF document text
    • https://biholka.cz/uploades/userfiles/file/dewimegitot.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16142f45e9f985---35059153133.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/6461941148.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/6500481597.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/xozodorexexenozojuwav.pdfIn PDF document text
    • https://yuanfuconstruction.com/ckfinder/upload/files/93522320200.pdfIn PDF document text
    • https://holycrosshealthcare.com/userfiles/files/sirugawozeletujeretuzilo.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613d736b8a991---11667452397.pdfIn PDF document text
    • http://kmconlinecme.com/userfiles/file/41127462557.pdfIn PDF document text
    • http://vasekurzy.cz/userfiles/file/miwexevo.pdfIn PDF document text
    • http://freetds.net/userfiles/file/negitamifajo.pdfIn PDF document text
    • http://yusungchart.com/userData/board/file/32394827813.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/4cddgev48235ms8dcmu4l658s5/toxomumuduxepenikivoxij.pdfIn PDF document text
    • http://lunaleo.pl/userfiles/file/nupozolobibodepes.pdfIn PDF document text
    • http://bkht.vn/userfiles/file/wuxobasaw.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_off0000e02a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE02A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f841.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF841 10872 bytes
SHA-256: 2ef96033cdb80b3e2e975ec4fb2d05625b4a42dc17403150f2296085ec3a9fc5
font_02_sfnt_off00011124.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11124 18384 bytes
SHA-256: 0e6705a162cb7cf38101b75acd4f836c181ac4175cd660aeb2b521a37a98acd5

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