Malicious PDF — malware analysis report

Static analysis result for SHA-256 d22fa3042a241612…

MALICIOUS

PDF

76.1 KB Created: 2021-09-20 11:51:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 05087633f481b97b8c181ecd10b0b6fe SHA-1: c26f03e21c4989e3ca470e753c1b29d8e0c0b8dc SHA-256: d22fa3042a241612e6c8c805a1f54ecf5901360589de5419a22b71a2459c6774
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, and it contains embedded JavaScript. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway scanning. The embedded URLs suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://allytemp.ru/uplcv?utm_term=can+zip+files+be+opened+on+android PDF link annotation
    • http://rosabaum.de/web/editor/files/19913073100.pdfIn PDF document text
    • http://ginzaramen.us/uploads/files/7282860695.pdfIn PDF document text
    • http://fractinvest.com/uploads/file/60986136577.pdfIn PDF document text
    • http://china-hold.com/UploadFile/file/20210904002955053.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/e7db1b922292e311a6e308f64201ecda/91521493534.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141f1ed288c9---13994689553.pdfIn PDF document text
    • https://100tmt.com/uploadimage/files/20210905131356.pdfIn PDF document text
    • https://interstudy.net/userfiles/file/povavigipaxurolemaj.pdfIn PDF document text
    • https://dpengineers.info/admin/userfiles/file/nesivituvalomajelaxedem.pdfIn PDF document text
    • http://likebarcode.com/image/files/20210905_091303.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/36274272070.pdfIn PDF document text
    • https://newchat.xyz/js/ckfinder/userfiles/files/72188842843.pdfIn PDF document text
    • http://www.enjoyvaltellina.it/admin/ckfinder/userfiles/files/68557247512.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/waturuposazovuvuk.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/nojoxowejegifan.pdfIn PDF document text
    • http://khojedu.net/userfiles/file/xokobozin.pdfIn PDF document text
    • http://fsanaq.com/upload/file/210907040642618877lx2vibt2vtrv.pdfIn PDF document text
    • http://zbirozskepodzamci.cz/userfiles/89538134346.pdfIn PDF document text
    • http://www.klimavill.com/data/editorfile/rifet.pdfIn PDF document text
    • http://ktcyy.com/ckfinder/userfiles/files/68189748755.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/161470277ca268---98419705338.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_off0000c634.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC634 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE46 17592 bytes
SHA-256: 14490b2e09d9ee13b4dba3a480103f27078e16acf753630227a1fe5636c27b55
font_02_sfnt_off00010af8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF8 10624 bytes
SHA-256: dd3a7a8d96380ee0ecde9ebb31adf2247ac296d8ac1189d80d8d51f3570ae901

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