Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ce855b37b50eb0e…

MALICIOUS

PDF

88.4 KB Created: 2021-07-29 21:29:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b27bf4e7d69093da2a63a5d81b180bb2 SHA-1: f3163fb6769a700ed6a4a197c19ab5cfdd8ccba2 SHA-256: 8ce855b37b50eb0e2d3296f8cac5f614df2e578c94b28ed02678c8185d123a27
156 Risk Score

Malware Insights

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

The PDF was flagged by ML and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with numerous URLs pointing to disposable or compromised hosting, suggesting an attempt to distribute malicious content or phish users. The document body is unreadable, but the heuristics indicate a deceptive structure designed to host many links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 6

  • 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.
  • 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://1877painters.com/FCKeditor/file/21067463697.pdf In PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/6ae9220eebe1da3bade033c7917cd8d9/fufesizebemebipifezume.pdfIn PDF document text
    • http://samnakthodrahassob.com/userfiles/file/79982723540.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/31795557522.pdfIn PDF document text
    • https://xn--mietkndigungsrecht-best-gpc.de/userfiles/file/dusadilanutumuw.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a64bb883cd0---83029555235.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///digasew.pdfIn PDF document text
    • http://tbff-bygg.se/img/files/nemovezegelibilazo.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/b8o8ooujbteg0ik7k59eq07h3l/jumukagifowadev.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/d7b0869ce5fc6aa09c9aa045f667048e/60268365127.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/6e6f2bc4f0e95c6ebba089f3e40711c2/23643074847.pdfIn PDF document text
    • http://logisticsnetworks.net/ckfinder/userfiles/files/gafabaluwujulinomi.pdfIn PDF document text
    • http://bazis-expertiza.ru/ckfinder/core/connector/php/files/16800694720.pdfIn PDF document text
    • http://tz5168.com/uploadfile/image/2021/07/20/file/20210720_002038_154.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160fa9772b2f7e---81840519783.pdfIn PDF document text
    • http://sakuragiramenandsushi.com/uploads/files/76348372045.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/lanimajidafakidevurejem.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/0m9e81vo8n4l8ksmbkroqq2dl7/rixur.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607835ca6f3f9---rawuzawolatesisomugi.pdfIn PDF document text
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/6780f5858863cd8d92a9b71934801459/tokowi.pdfIn PDF document text
    • http://cameradungphat.com/uploads/files/11274366701.pdfIn PDF document text
    • http://granite1962.com/clients/869125/File/kifiralupokojibozedini.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c21b8c3f3dc---tifofetolonukodelizi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=whatsapp+back+up+von+android+auf+iphonePDF 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_off0000f1b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B7 11064 bytes
SHA-256: c7f0e03dcc98577f8b8790708e1072a870ab9db0de1e8868ed3f353695fe5c1d
font_01_sfnt_off00010b48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001235a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1235A 18124 bytes
SHA-256: c4f801de883e57f62740d782ca8a444436b0ee577ca14e7a231b8e1ea0a48152