Malicious PDF — malware analysis report

Static analysis result for SHA-256 a72ca46b357d862e…

MALICIOUS

PDF

96.0 KB Created: 2021-09-04 10:30:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 52c7cb9cb6cd0e0692f04fc9363dc9a9 SHA-1: 151685d9e7ed416acfc19dacab857884022752ae SHA-256: a72ca46b357d862e1958a7b4d03809b9f6bae3de92418de9300527f490bb67e6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to various domains, many of which are associated with compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of external URI heuristics further supports the attack pattern of directing users to external, potentially harmful, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://nomylo.ru/uplcv?utm_term=asma+y+embarazo+pdf+2018 PDF link annotation
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089b22c57f6d---33087110882.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160825f5c83c28---dakoko.pdfIn PDF document text
    • http://cementfeet.com/userfiles/file/kowenanaforimovodixit.pdfIn PDF document text
    • http://albertopizzetti.it/userfiles/files/5074621888.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/a3t7nev33s6llmmmsi7stdf9e1/31142746311.pdfIn PDF document text
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/lonulinibixijiredirubeda.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/14935702952.pdfIn PDF document text
    • http://ansing.nl/userfiles/file/vomurilowosenadamobuvaf.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/abdqe89jk5f4642rsp0rqje485/26598054833.pdfIn PDF document text
    • http://bukharajohnscreek.com/sites/default/files/file/saxij.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/gudadulusekutem.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/c3e2043f745a29ef787f41519394878f/88802999528.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/nvf1i7914dau9oe4eja5kftur6/bilif.pdfIn PDF document text
    • https://dietacud.eu/upload/file/lobonedumezereziwin.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/nq46m6choibo51fvn1at6qbcpf/3767137026.pdfIn PDF document text
    • http://serenetour.com/image/upload/File/xepoxa.pdfIn PDF document text
    • http://talani.nl/userfiles/image/file/wonobojomukimufurotamomog.pdfIn PDF document text
    • https://krossi.ru/images/content/files/11255613215.pdfIn PDF document text
    • https://roshnaai.com/ckfinder/userfiles/files/40161980761.pdfIn PDF document text
    • http://ccsup.co.th/uploads/ckfinder/files/tadikoxi.pdfIn PDF document text
    • http://csc0311.com/userfiles/file/20210620191518_02bspn.pdfIn PDF document text
    • https://sbsoftware.ro/admin/userfiles/file/54725954858.pdfIn PDF document text
    • https://alasclub.gr/neuro/ckfinder/userfiles/files/wegemuf.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b45c32b73b8---gopipojesanaz.pdfIn PDF document text
    • http://nguyenquangcomputer.com/upload/ck/files/xitopogebabud.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_off000109e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E7 21200 bytes
SHA-256: bde2980d64a9d4c4602e5d80558f418408f91225f15e64dd79bd6ada39b8de89
font_01_sfnt_off00014017.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14017 11116 bytes
SHA-256: 0d03395d9db793e2ba95b3f1d3cdefc53a405b0134d56cedbc12291a6f787007
font_02_sfnt_off000159fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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