Malicious PDF — malware analysis report

Static analysis result for SHA-256 63696056f9a23ac5…

MALICIOUS

PDF

83.8 KB Created: 2021-09-12 16:27:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e3414793673f4ac099826cdec9d31e5e SHA-1: a0cbd41d0284f535441b38460e917aba0d013eaf SHA-256: 63696056f9a23ac5677cabac6855442f8678e89545c3e44cf07243bdc4f99222
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://easyliveconstruction.com/ci/userfiles/files/3230027820.pdf
    • http://downtowncincyhotels.com/core_degree/admin/images/cms_imagesfiles/18972294859.pdf
    • http://boilerservis.ru/uploads/files/parogemojipokasunego.pdf
    • http://bestbuyfromindia.com/userfiles/file/92916172293.pdf
    • http://xahscw.com/userfiles/file/74367316284.pdf
    • http://www.mezmat.ru/ckfinder/userfiles/files/56598710000.pdf
    • http://impressivetravelvietnam.com/upload/files/72606546053.pdf
    • http://stavo-bazar.cz/userfiles/file/jesepanesizatisome.pdf
    • http://villaelen.it/userfiles/files/rarigezumotudukokapixab.pdf
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613794cd4f10e---wugodifupelaveja.pdf
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/91560927486.pdf
    • http://ketnoikienthuc.com/upload/files/86420138324.pdf
    • https://xaydungdonggia.com/app/webroot/files/images/pages/files/sigifuvoparike.pdf
    • http://apartmany.cucoriedka.sk/data/files/lojuxutuxese.pdf
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/d795deae9c73a5b6e22467c34bc6a749/98662189702.pdf
    • https://areopag.ru/sites/default/files/uploads/4811019803.pdf
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/ao4v2u8psaroot6jb0li50kr8l/pazakanogonefukikotu.pdf
    • https://semot.com/Store/userfiles/file/14261883339.pdf
    • http://yuanjiangchem.com/upload/files/pitosi.pdf
    • http://wdnederland.nl/file/mexoforimutudogadapufil.pdf
    • https://ymy-tea.tw/upload/files/83464086019.pdf
    • http://medwin.kr/userData/board/file/sapawizafur.pdf
    • http://master-vin.ru/files/file/gitafizitijosusalogi.pdf
    • http://kossuthdigisuli.hu/userfiles/file/xipadelakuxezaxujogofata.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=f+chord+easy+guitar
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e41c.bin
aaf028371212dc786f046ced10e5008894a7f29bb96170f1cf8625e9e49b026d
pdf-font-stream PDF embedded font (sfnt) at offset 0xE41C 10692 bytes
font_01_sfnt_off0000fc9d.bin
1f59fd323bc86f6f110f27fcd1a40a246f407c10c8d88cc77434de030184dbff
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC9D 17416 bytes
font_02_sfnt_off000129fb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x129FB 16792 bytes