Malicious PDF — malware analysis report

Static analysis result for SHA-256 35a05dcbd33ade04…

MALICIOUS

PDF

80.3 KB Created: 2021-09-03 18:01:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b429d65514bd192d894042a3ad514369 SHA-1: e3600b2bac94669ca28c82190e71241751e4df92 SHA-256: 35a05dcbd33ade04b955eda13c961075d2e25119a2a3d690b1733b785f89c191
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous URLs pointing to compromised WordPress sites and other domains, suggesting it functions as a link farm to distribute further malicious content or phish for information. The presence of embedded URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate a deliberate attempt to create a deceptive web presence for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ketchas.ru/uplcv?utm_term=base64+to+pdf+converter PDF link annotation
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3b0835612---teromozulina.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/48979683304.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/dedimaluloku.pdfIn PDF document text
    • http://saltokisport.com/uploads/files/ridazapurogopopusupafewok.pdfIn PDF document text
    • http://www.lebedosapartotel.com/data/yukle/files/nenuvadoteko.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/th025n9ib6bakcf88a8mupsqu7/63126960780.pdfIn PDF document text
    • http://sanxuatbanthinghiem.org/app/webroot/uploads/files/63801306377.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160944373b935f---rubalizenunuzamuzekipow.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1606fcef9cd538---40493444601.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/gubesitinazejimegapigime.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607365e18bdc8---17468518431.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608499e8e8b85---dedigexokadamorunefam.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/fodofewularetebuzon.pdfIn PDF document text
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/jutag.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/murolukarirowevafuguxod.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/nolaguna.pdfIn PDF document text
    • http://www.benyowsky.com/resources/files/22063928208.pdfIn PDF document text
    • http://mmbc.cz/_data/user_files/file/99755955952.pdfIn PDF document text
    • http://anthonyellisonfamilyreunion.com/clients/f/ff/ff850d76676c1858bf5e443b7a907d3b/File/xaburotunirifitobajirewu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2fb5eaf973---22417134782.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210812104418.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160768de2c6435---wavijofimewoferuze.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_off0000d53e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD53E 17596 bytes
SHA-256: 0854cd23096b39c0d87891bdf512f6a7fd3bf4deef62b1b8e323d1704fc2a2c2
font_01_sfnt_off000102f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B0A 10840 bytes
SHA-256: 2f924c7cbb40430faf1e07666407796a753346b98e06ee955194deba0e47ecb6

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