Malicious PDF — malware analysis report

Static analysis result for SHA-256 a45fea128c875352…

MALICIOUS

PDF

92.2 KB Created: 2021-08-04 01:45:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: de8975a2ff3ffdc722eb2cf5a3b2795c SHA-1: 38f07405a7109ef38163bd0bb21d78dbdb625eda SHA-256: a45fea128c875352ce1b7555a970aee7af40e792ebcbce68cd0196db38e73822
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous external URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a pattern of using external links for malicious purposes, likely to distribute phishing content or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://crysiq.ru/uplcv?utm_term=floureon+walkie+talkie+manual+volume+control PDF link annotation
    • https://kit-veron.my/ckfinder/userfiles/files/lezewabegunesegexipo.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/v015savkebkdn0o4uf6jba428k/33006779262.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16085d581e4edf---24403414414.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091c798656b2---27021945562.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/8479978535.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/23705100968.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd0e19025d---34863384225.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/paximopozepanenozuferiw.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/hjaoepo1cc509i30pjlsoe85cv/23058140712.pdfIn PDF document text
    • http://nenkin-t.com/upload_img/ck/files/jizobevedozesijibuguka.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/kenana86bvpobdqlsm2lcfdgr1/pugalosefixuboliduxaxuji.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160764bb97505c---95761750891.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/d0081785026c2231491145881a87741b/98619432217.pdfIn PDF document text
    • http://famillespourstarlight.ca/clients/a/a9/a9b42c05011d3bb27e7f7ec2ed30324f/File/purowalojeb.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef48f06b5f---91608004768.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c449d07cad5---vobevixogosarupovagukamog.pdfIn PDF document text
    • http://domplus.su/userfiles/files/52809164873.pdfIn PDF document text
    • http://tatvideo.ru/ckfinder/userfiles/files/93324801747.pdfIn PDF document text
    • https://www.nvsrolko.org/ckfinder/userfiles/files/fojomatimunubupimato.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa1917d0bb---42231220802.pdfIn PDF document text
    • http://nhaphangmy.us/upload/files/74073395891.pdfIn PDF document text
    • https://irantruck.ir/data/file/vaxuwufibusixenivinufalug.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/79085968758.pdfIn PDF document text
    • http://allycatering.com/userfiles/68241493751.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3319b8785f---35918697343.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_off00010683.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10683 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011e95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E95 16588 bytes
SHA-256: 214a0dd689875d2af403fabb592ca2f41eada94aea712c2fe7458e6c847e13fa
font_02_sfnt_off000149c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149C5 10544 bytes
SHA-256: 6519de2ba7e4d8f98405769a067af974a92369d3bd9bd5b5ef58f3ec45ab6242

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