Malicious PDF — malware analysis report

Static analysis result for SHA-256 63fcfccc50d4656d…

MALICIOUS

PDF

93.2 KB Created: 2021-06-28 02:56:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a136a91c1b06bac03318d604e4a080b4 SHA-1: a92477ff67e0d3b5499a706fcdda6f961277f7f9 SHA-256: 63fcfccc50d4656da0bfd49a6cac91703cdfe06eac61971074a5b2574110744b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to distribute malicious content or phish users. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classifiers also flagged it as malicious. While no scripts were explicitly extracted, the structure and URL patterns strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://wastran.ru/uplcv?utm_term=human+reproduction+explained
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160781ae3b2847---vitalimuvijug.pdf
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160857d073090a---meriwolusileribajabatagaf.pdf
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/07e5a37307a5c69b8f0f8a151f498293/54523612886.pdf
    • https://7gking.tw/upload/files/domufixerurarilumepevari.pdf
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/b3bc49a79cdf36961103e85a092b5b33/wimilazixesunomanulijo.pdf
    • https://accuratesearch.com/userfiles/file/pulukasafavofudi.pdf
    • http://lnaixi.com/userfiles/file/20210626002419_1498833834.pdf
    • http://www.ortodonciaelisafarache.com/ckfinder/userfiles/files/tufimipawep.pdf
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607c739e51062---28488057388.pdf
    • https://mayurherbal.com/userfiles/file/komumokiwoke.pdf
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/16081c80f696bb---37420224702.pdf
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/1c84e2460058506c3ebf980ebdb17391/sigibavabifidi.pdf
    • https://stopserv.ru/files/file/tugijesanuso.pdf
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/16081c3743d481---28059850475.pdf
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/cee6bf1c11c201334b9fa6281231055c/loviledidaviliguf.pdf
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe27a2e8f9---mipikuwabitarakazitadibip.pdf
    • http://marthomaiticherukole.com/userfiles/file/mafegifoponika.pdf
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16073af624dcc8---1075189575.pdf
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/12a470d84c4e62c7d415b26743dc67ec/xupemozekimikuv.pdf
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac843191391---28687883947.pdf
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/64bebe72ed16380c479fb1c38f92efff/49114467473.pdf
    • http://analogsys.com/uploaded/file/43652315560bc6cfda3952.pdf
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085e4b975e87---gorukujoxow.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010a59.bin
4f6108ad7846666be6d0c9ce16e2e91b6084adf28aaec348b8fddfced91ba83f
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A59 10700 bytes
font_01_sfnt_off000122c1.bin
d6c79a7ca746f2b06dceeb23bdf60fc51f1ade79d777d3adc05bd164cfd9cf91
pdf-font-stream PDF embedded font (sfnt) at offset 0x122C1 17016 bytes
font_02_sfnt_off00014f7d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14F7D 16792 bytes