Malicious PDF — malware analysis report

Static analysis result for SHA-256 39087d20579bfa5a…

MALICIOUS

PDF

93.0 KB Created: 2021-10-07 01:14:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9039fcbef173dd6cf5b1cd5c45d1ba3a SHA-1: 8c2909798cc9339bdc4ad8d8bb1a6219a094def0 SHA-256: 39087d20579bfa5a68c0140ff1e6f44954988a560246f951542a566cde237d71
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm or phishing lure. The presence of embedded JavaScript and ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests malicious intent. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://drafthe.ru/uplcv?utm_term=floyd+landis+and+lance+armstrong
    • http://fruitsad.pl/images/file/voviraxadoxuvuvufomoxonid.pdf
    • http://kcwoman.medsoft.kr/pds/userfiles/files/56921266586.pdf
    • https://pacie.vn/web/uploads/files/34564637507.pdf
    • http://silesiacapital.eu/data/file/ridovitediva.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/rhckntf36tr71godoqusaokjpj/64034912773.pdf
    • http://www.hussco-steel.com/husscofiles/files/votabizotapi.pdf
    • https://pu-sk.com/app/templates/js/ckfinder/userfiles/files/72255124940.pdf
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/70375173130.pdf
    • http://workontext.ru/media/file/terarugusus.pdf
    • http://studioferrato.it/userfiles/files/sojulitisigidajomefitageb.pdf
    • http://abpaluso.com/upload/file/zutegoninazebevirapi.pdf
    • http://xn--80aaaaadfwa5aftjhxrkcrg8iwc.xn--p1ai/pict/file/43865069865.pdf
    • http://fpempresa.cen.es/userfiles/files/lofejuvixalegurozu.pdf
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aca71c7d18---67429625893.pdf
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/161584fccd4ee9---55112275162.pdf
    • http://wienbildarchiv.com/upload_files/files/lugugujoposeko.pdf
    • http://2016.letnifestiwal.pl/ckfinder/userfiles/files/vomunetukategovejuse.pdf
    • http://www.parinet.fi/tiedostot/files/7026645018.pdf
    • http://barcabianca.eu/upload/file/79526894697.pdf
    • https://dichvuketoansg.com/luutru/files/gusig.pdf
    • http://awkontrakt.pl/ckfinder/userfiles/files/gapusifod.pdf
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16137035551a2b---fotivejosugu.pdf
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d9b3e5d0a3---17533231721.pdf
    • http://koovappadyscb.com/ckfinder/userfiles/files/guvezafabivavu.pdf
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e788.bin
a177a744abe3b2a43e81dfe88fde6b57d7da05d50fdd64efebde3ce24c2b0a8c
pdf-font-stream PDF embedded font (sfnt) at offset 0xE788 18936 bytes
font_01_sfnt_off000118f3.bin
620e0fbd8f7e7b151c12f6e607acabff303586541b6653778e6fe7b2b97ed9ce
pdf-font-stream PDF embedded font (sfnt) at offset 0x118F3 17532 bytes
font_02_sfnt_off0001335e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1335E 16792 bytes
font_03_sfnt_off00014b75.bin
c714eacadb9d78ddfbdb3a8543452948fc2ec96148f75f74c29d55654318fb0a
pdf-font-stream PDF embedded font (sfnt) at offset 0x14B75 10804 bytes