Malicious PDF — malware analysis report

Static analysis result for SHA-256 1624fe2be789f3db…

MALICIOUS

PDF

93.2 KB Created: 2021-07-29 19:26:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5750e873f014a462cbd1388a7ccce2eb SHA-1: 297a7bf429f8205f65a05d598c064c93b916e4d3 SHA-256: 1624fe2be789f3db13dfeb5fbd361cb96abd297d5f7c4a78f21af933aa65cf34
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file exhibits characteristics of malicious activity, including malformed streams and a high ML classifier score. It contains numerous links pointing to compromised websites and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of external URIs and link farms indicates a likely phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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=reading+comprehension+skills+and+strategies+level+1+pdf PDF link annotation
    • http://etoprosto.ru/ckfinder/userfiles/files/tonudukiwojewisiweto.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608af8cf1fffc---wupoxapiwixitevevofijito.pdfIn PDF document text
    • http://mgocsm.in/userfiles/file/gujadem.pdfIn PDF document text
    • https://dannysacademy.com/ckfinder/userfiles/files/dokasegederigedipidi.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/97524066906.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16090c8987990a---kanititotuzoxanomito.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/89cfc7cb23f148b3211c5e779758bdaa/50008837923.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078c65942a6f---28029574986.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160ec533ab35cd---xikerilodugavutix.pdfIn PDF document text
    • http://akwarella.pl/user_uploads/file/kugogifozexin.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609493b88029e---10805524184.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090d0d7e49d8---losetifozadezujuferodu.pdfIn PDF document text
    • http://vyveva.eu/UserFiles/File/26139495144.pdfIn PDF document text
    • http://www.sospapa24.com/lib/ckfinder/imgupload/files/39726136978.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/kogafadakabozawexorowizex.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/joxubavijudixowasoneja.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160853d909a1c4---wuwogab.pdfIn PDF document text
    • https://ises.ca/phpsites/vertical_living/uploads/file/rezelazegibivimolabubel.pdfIn PDF document text
    • https://www.q-jin.ne.jp/ckfinder/userfiles/files/bukoxod.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/65144222952.pdfIn PDF document text
    • https://www.deuba.info/wp-content/plugins/super-forms/uploads/php/files/7gigv2hmv1a51rp5v2f0kog1oj/42864232843.pdfIn PDF document text
    • http://pro-elec.ru/ckfinder/userfiles/files/nubomabesutijetaraxinawa.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_off00010855.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10855 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012067.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12067 16704 bytes
SHA-256: 3187bf503b8756164be159bff264a1126411f16deb7c6090d108d5b9aed86976
font_02_sfnt_off00014bad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BAD 11324 bytes
SHA-256: 53500987267180012f3cc1d2f6f53eee5d09c544a36a7bf0ac08842beab84c35

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