Malicious PDF — malware analysis report

Static analysis result for SHA-256 91606130aa21f5d6…

MALICIOUS

PDF

83.1 KB Created: 2021-09-18 19:09:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a0727fdf2269dae428ac24a117e8fd7c SHA-1: 6d7bd7dd19b6b4e42f1130c6f7f068f753bca9cb SHA-256: 91606130aa21f5d627caeac0e78ed8e2a250249701f23154de177dcef21e579a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious link farm designed to lure users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • 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://nomylo.ru/uplcv?utm_term=how+do+i+change+my+play+store+location PDF link annotation
    • http://jmvlpslimited.com/ci/userfiles/files/10329111352.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16131c5f2e239f---panirijedogulogalofeveju.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134116ed068c---nanukifiv.pdfIn PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/87754622190.pdfIn PDF document text
    • https://uleshuzatabc.hu/files/file/98726048308.pdfIn PDF document text
    • http://klubbelgickychobrov.sk/editor_uploads/files/49064202581.pdfIn PDF document text
    • http://sskj.pl/userfiles/file/69392909712.pdfIn PDF document text
    • http://hwayoung.kr/upfile/files/26233996334.pdfIn PDF document text
    • https://mut-zur-veraenderung-hambuch.de/userfiles/file/99152466786.pdfIn PDF document text
    • http://sunnysolutions.it/uploads/assets/file/sanalab.pdfIn PDF document text
    • http://zjqzzx.com/uploadfile/file/2021090400102473499.pdfIn PDF document text
    • http://cerritos.songhakbbq.com/uploads/files/87061166942.pdfIn PDF document text
    • https://jasz-pap.hu/UserFiles/file/wanafesokomuwomefin.pdfIn PDF document text
    • http://randygordonlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/65639409350.pdfIn PDF document text
    • https://www.greenlakecruises.com/ckfinder/userfiles/files/fatufuvepuparujam.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/g2e9aqd0h7or26tha3m3tqg595/34948206197.pdfIn PDF document text
    • http://www.slappedtogether.com/editoruploadfiles/file/kixereworu.pdfIn PDF document text
    • http://pjteam.hu/uploads/xivoneb.pdfIn PDF document text
    • https://listapp.in/ci/userfiles/files/58974229707.pdfIn PDF document text
    • http://liburnia.pl/userfiles/file/bumufesiri.pdfIn PDF document text
    • http://9meclinic.com/ckfinder/userfiles/files/77308716782.pdfIn PDF document text
    • http://mavelikaradiocese.org/rapha/ckfinder/userfiles/files/xuwikazosusosizonenobo.pdfIn PDF document text
    • http://multi-accueil.fr/ressource/site-image/files/78182440065.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_off0000df2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF2B 17836 bytes
SHA-256: 62c2e7d707dd0ed4a9026c8565b8a749e872871eb695fdd064733d8a1d0a1cd8
font_01_sfnt_off00010d30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D30 11152 bytes
SHA-256: 21151e7715f1ea0162410ea53ce0bcfa054a140c57de616b4b2bd4c89c28f2bf
font_02_sfnt_off000126df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1