Malicious PDF — malware analysis report

Static analysis result for SHA-256 c55d24ebb9300822…

MALICIOUS

PDF

86.3 KB Created: 2021-09-01 08:21:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: b5f497e741bf465140b0e6e5e6138e69 SHA-1: e7ef3b732aa017fdef0d906a72c2a37b0c5de3c2 SHA-256: c55d24ebb9300822143a07fd1e34df277ce4c6b093aa8c3f0f9f10d48aa0794d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classification and ClamAV, indicating it is a phishing or trojan PDF. It contains numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a phishing lure, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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.
  • 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 https://smidgel.ru/uplcv?utm_term=gk+questions+with+answers+for+class+6 PDF link annotation
    • http://tlumacz-lipno.pl/pdrzewiecki/files/zebopijifop.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/fewerotadotawowotoxi.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/85ea0a363030819121c3ec21ae9bfefd/fowiribilogepipabelufe.pdfIn PDF document text
    • http://fatamorgana.fr/uploads/assets/file/70664425402.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e89e7a55a5---vakuranatugebekovogupiwa.pdfIn PDF document text
    • https://eghamatyab.com/basefile/bainbookcom/files/kisuxenawadenuxeribux.pdfIn PDF document text
    • https://cleartunemonitors.com/ckfinder/userfiles/files/54024035083.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/novunosatasawubik.pdfIn PDF document text
    • https://scanclean.bg/upload/ckfinder/files/11888275946.pdfIn PDF document text
    • http://abwferrellpkwy.com/uploads/files/80162710793.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/85ff8d3d702941ce3118b95e48d706ce/19290186277.pdfIn PDF document text
    • https://iringmalaysia.com/ckfinder/userfiles/files/45966721024.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bc264056c98---56789439365.pdfIn PDF document text
    • http://dongshengcable.com/images/upload/File/zulosesimamufegamim.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1fc1389af5---vabamewuj.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/6013c7cfe99bb5f0188a6c3a05aefa87/63268385116.pdfIn PDF document text
    • https://netron.pt/app/webroot/media/files/jaxobu.pdfIn PDF document text
    • http://shangrilatheshow.com/ckfinder/userfiles/files/jarivofirasu.pdfIn PDF document text
    • https://www.indoorclub-informa.com/boletines/img/file/44646819332.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16082426b8c7b6---63267310661.pdfIn PDF document text
    • http://hytechplus.com/userfiles/file/35462931512.pdfIn PDF document text
    • http://dreamcatcherltd.com/userfiles/file/wuvesofusujusak.pdfIn PDF document text
    • https://apra.pl/files/file/21264929075.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_off0000eae5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE5 17872 bytes
SHA-256: ffa9ada062ce64f873a04fb3bd0da7d857e9836c821eb15445db0f8541a88752
font_01_sfnt_off00011995.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11995 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000131ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131AC 11064 bytes
SHA-256: 5773ed53df86cf9047830b0c0de15367f98c2fb6ce5e37796102967a2cc1060c

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