Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0c3e650ce40c223…

MALICIOUS

PDF

80.8 KB Created: 2021-09-03 07:56:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: bdb230b96a8117a267233b460c2c63a7 SHA-1: c0ff14b93d4cc60754ce1d1647052660f5971b1c SHA-256: a0c3e650ce40c2237998b0a77421d6eb32b510a5c907a2bf7bcbbcec89d1a42d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, some hosted on compromised CMS uploads, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using disposable hosting for these links, further supporting a malicious intent to distribute malware or phish credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • 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.
  • 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://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/xudufifagolimazeladumabed.pdf In PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16087dcd8073de---fusuresudetovox.pdfIn PDF document text
    • http://www.kymkarajok.net/tiedostot/files/72196868179.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a76e3555437---mefenakeguzobonotazobibi.pdfIn PDF document text
    • http://www.majbrno.cz/uploads/files/28894675734.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/zusonujabanijazadibav.pdfIn PDF document text
    • http://clubselectionvoyages.net/images/file/93803063231.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/33972906753.pdfIn PDF document text
    • http://cainghienbinhduong.com/uploads/userfiles/file/kudeludow.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/156867a200660fa8894784aac154b7f4/84903937859.pdfIn PDF document text
    • http://jumpstart.mobi/userfiles/file/33459796725.pdfIn PDF document text
    • https://amatnieks.lv/pictures/image/25044209729.pdfIn PDF document text
    • http://linkingpeople.info/userfiles/file/57084279320.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dabd57ec42---60406707022.pdfIn PDF document text
    • https://alsharqcc.com/userfiles/files/45694670282.pdfIn PDF document text
    • http://sitoad.com/bbqjoekey/files/202107162113481376.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/dccea519eb552c38bafb3b04f0adda5d/fokawikejo.pdfIn PDF document text
    • http://dokturmice.com/ckfinder/userfiles/files/vufewituxoxexexa.pdfIn PDF document text
    • http://onmamtour.com/FileData/ckfinder/files/20210717_5FD8A0B969F1D6D1.pdfIn PDF document text
    • https://nhaccugiare24h.com/uploads/userfiles/file/16807679154.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/s1jlpfactopdhvhbqt1ud6ejfg/ronenuvukajasevodowabuv.pdfIn PDF document text
    • https://summit-christian-academy.com/scauserfiles/files/vamopuxademeripubas.pdfIn PDF document text
    • http://d4sontario.com/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/30180144420.pdfIn PDF document text
    • http://jfhcoaching.com/userfiles/files/goradujexuxitiduwuta.pdfIn PDF document text
    • http://starrsgazette.com/admin/images/file/nuxelabatarurom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=free+online+file+converter+xls+to+pdfPDF 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_off0000d8d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D8 16984 bytes
SHA-256: b4b08ae907b049cba0e04a86748cfdae1a94b8b82da76e1c74408ec9baa455d0
font_01_sfnt_off000104ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104EE 10596 bytes
SHA-256: 922982400bb4997d322ff3012c0115f4dffcc97b305f00a5d5d60ca14802767d
font_02_sfnt_off00011d41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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