Malicious PDF — malware analysis report

Static analysis result for SHA-256 788147cfccc55a0e…

MALICIOUS

PDF

67.9 KB Created: 2021-09-18 18:22:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 028d79917398e6b8a03014ad7ca96818 SHA-1: 7e8860c22013520b8593b45e148031de9a8237c9 SHA-256: 788147cfccc55a0e92fe21259af62cd25a0936fe6a75d5ddff875f7a820bfefb
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. The presence of numerous embedded URLs, many pointing to file upload directories, suggests an attempt to distribute further malicious content or phish for information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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 http://gammatradings.com/userfiles/file/145561003.pdf In PDF document text
    • https://ximangcampha.vn/upload/files/10225955526.pdfIn PDF document text
    • http://lemma-studio.pl/userfiles/file/nuramolule.pdfIn PDF document text
    • https://markaoyun.com/calisma2/files/uploads/rorafixofutatirozizujebo.pdfIn PDF document text
    • https://rtquery.reitoken.org/Coaching123/images/files/17194248532.pdfIn PDF document text
    • http://metrocars.london/survey/userfiles/files/96792890852.pdfIn PDF document text
    • http://ride.hu/images/uploads/files/55288680559.pdfIn PDF document text
    • http://tanphatinst.com/vietkiendo/upload/file/61983696138.pdfIn PDF document text
    • https://psychotherapie-coeppicus.ch/userfiles/files/losojalugixilipubave.pdfIn PDF document text
    • http://natur-pet.cz/webpagebuilder/ckfinder/userfiles/files/20798953783.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/uhjp136uhmviaiq8gunsbodk7c/fajilo.pdfIn PDF document text
    • http://cyclad.org/UserFiles/file/48747313352.pdfIn PDF document text
    • http://xn--12cfu9bc1efac9a9azfdsb7b9d1f0j.net/ckfinder/userfiles/files/46579513361.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/xunululurabeguxetoxepu.pdfIn PDF document text
    • https://ruiguoex.com/upfile/files/2021/09/03/81094409677.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137e193a0bf3---takudagejalawotux.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/53755360960.pdfIn PDF document text
    • http://tivatijapan.com/uploads/userfiles/file/87859874055.pdfIn PDF document text
    • http://xsjsbzrw.com/uploads/files/10411383354.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/a6223bbee8eb088346c69e79aaa25c67/fawamamawufenox.pdfIn PDF document text
    • http://alexandersorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lukovojokupulasux.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/a5c3eb1e843c09caedaef8c45d646510/goxunaxotabomanuwe.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/52712342250.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133dc491172e---56525773315.pdfIn PDF document text
    • https://attackworkoutprogram.com/app/webroot/files/ckfinder/userfiles/files/winomuridafonimoduwu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=among+us+ios+modPDF 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_off0000b0b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c8c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8C3 14340 bytes
SHA-256: 6080f455cfc1c6e024f41a2b1094b7275ad3908f36ce5bd9a36dda2ce3fef258
font_02_sfnt_off0000ec57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC57 10132 bytes
SHA-256: be7cbced350371df995c58e828d2d8311a2158eb8e8f32af67672cf2c85261c3

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