Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2d9bf516168f938…

MALICIOUS

PDF

81.6 KB Created: 2021-09-17 22:20:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 14017f6973dacbc8cc982342b7ba1f90 SHA-1: 8a83828ea6e9fc7d901b75fe3cdd834e5383f28c SHA-256: a2d9bf516168f938930f0fd85c0257dcabe910c2f2f6744d9dfb011c8a9f5711
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm hosted on compromised WordPress sites, suggesting a lure to download further content. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to provide a password for an archive, a common tactic to bypass gateway scanning. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with phishing and malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • 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://bloomlight.pl/_bloom/file/masile.pdf In PDF document text
    • http://gerocuki.hu/user/file/zekagalazezugederiguwur.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612eab2a85e5d---24947028784.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/161365b31f3457---32669497051.pdfIn PDF document text
    • https://kluchar.net/klucharnet/images/file/tusavetaroxaz.pdfIn PDF document text
    • http://solarissoft.com/img/userfiles/files/81515739277.pdfIn PDF document text
    • https://yellowstonewildlife.com/35131360558.pdfIn PDF document text
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/74452020814.pdfIn PDF document text
    • http://retrofotr.cz/files/file/jitavisoragijedob.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/31743648222.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161362af4d839e---vusumifokuk.pdfIn PDF document text
    • http://veterky.ru/ckfinder/userfiles/files/vinofemizamojemazaxozutir.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/files/zozotuwisadonenemajij.pdfIn PDF document text
    • http://azco.friend-match.com/upload/files/xefufutogajajefigije.pdfIn PDF document text
    • https://maftplayer.net/calisma2/files/uploads/suzepixi.pdfIn PDF document text
    • http://5lovestartw.com/CKEdit/upload/files/45145916388.pdfIn PDF document text
    • http://petukmahaaaraj.com/userfiles/file/90605541737.pdfIn PDF document text
    • http://laconchigliacasevacanze.it/userfiles/files/pixofozena.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/3b7f75e53a7b325315f6610034be2f8f/45900741696.pdfIn PDF document text
    • https://behbehaniprojects.com/uploads/files/1829498362.pdfIn PDF document text
    • http://cmorshomecareassociates.org/uploaded_files/userfiles/files/22828834911.pdfIn PDF document text
    • http://123flower.doweb.kr/upload/files/tosoxek.pdfIn PDF document text
    • http://fra2ange.it/userfiles/files/fabus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=como+ver+mis+claves+wifi+guardadas+en+androidPDF link annotation
    • http://mustang.tom.ru/jsplugins/ckfinder/userfiles/files/xunezosabivelomexa.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_off0000d7db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eff2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF2 11004 bytes
SHA-256: 8771335cb65224dc1001ba5003c4265b5135ae576d5c0b9bc5fdf1eb3fe26a1e
font_02_sfnt_off0001095d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1095D 18544 bytes
SHA-256: 9d3608d6efa9173349b6b8dfe9e7e49b7cbfd289f20e6ec566d901a1f5cdbd4a

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