Malicious PDF — malware analysis report

Static analysis result for SHA-256 71b75b3c5a37cb20…

MALICIOUS

PDF

81.4 KB Created: 2021-09-06 06:49:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9e939f6a246e60cc341cf5de7df08d71 SHA-1: 78e22e606ba6586ad9800c94ca48c8ed29200541 SHA-256: 71b75b3c5a37cb2034ba4fbae0864a82ce59d541e4880c339cf573a2f1ed6384
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by multiple heuristics as a link farm, with many URLs pointing to compromised WordPress sites and disposable hosting. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. The document body is heavily obfuscated and unreadable, but the presence of numerous links suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://ankaser.com/userfiles/file/narivaruwibidesimakodusu.pdf In PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/0cj6aq3n581j49u5ts62pf0nea/6073542042.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/8312221e4467f9c87063c47a07aa3767/76168821610.pdfIn PDF document text
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/tebohhjd9ic3jcddeb2fu52ggd/gurivebajeruxibutid.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/6odvh0fn642u6o7lq5tjg8en8p/tunisupibo.pdfIn PDF document text
    • https://korovin.org/site/img_ufiles/lebotugakekofixerutul.pdfIn PDF document text
    • http://webcertain.ca/contentupload/fckeditorUploads/organization_/file/pefuxevi.pdfIn PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/6850760115.pdfIn PDF document text
    • https://addsfly.com/userfiles/file/68128023992.pdfIn PDF document text
    • https://tavcam.com/upload/ckfinder/files/mumapisimusilonalo.pdfIn PDF document text
    • http://bftt.marketsearching.com/upload/files/78464847811.pdfIn PDF document text
    • http://fantalife.nl/userfiles/file/rutagovapogemug.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b4a453e392---xasulajexumew.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/sekukugubaxe.pdfIn PDF document text
    • http://mmprogetti.it/userfiles/files/26000956724.pdfIn PDF document text
    • http://netisiletisim.com/guvennet/resimlerfiles/ritagefadupa.pdfIn PDF document text
    • https://floridagreatescape.com/media/file/padipotulekifetab.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/2e3c9a0ad79b338d22acffd4166fbfe2/tupafanodogib.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a042cdc0146---19233819934.pdfIn PDF document text
    • https://crownprolaw.cn/userfiles/Proj_Name//files/buzukusujidowevebuxilutiw.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/wetubagimolezuw.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1612613fcd7dba---livimaxepodabevawu.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/datasiwetubaro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=citizenship+advancement+training+pdfPDF link annotation
    • 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_off0000dc0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f41e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF41E 16420 bytes
SHA-256: 040adb7b4c209b08eddf4bad33acd3e864772b2052fe35731bf764ad5471a4a1
font_02_sfnt_off00011e2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E2D 11056 bytes
SHA-256: 3653dca88f0c3ede2d6eff35a223720da6e7c7cdf82b9cd86b5497e21c4d87b3

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