Malicious PDF — malware analysis report

Static analysis result for SHA-256 d99789dce68d321b…

MALICIOUS

PDF

85.4 KB Created: 2021-08-08 13:50:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 42cd20db6cc1b3d5fb6f2aae8bcdf51a SHA-1: b30046bcc88c9bdf0aedc4eef81675590c7877ec SHA-256: d99789dce68d321b60f1f867a10a80293f95b7db39214118334c0b2dbead315b
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous links, many pointing to compromised websites or disposable hosting, suggesting a link farm or phishing lure. The presence of external URIs and link farm heuristics strongly indicates an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://www.houstonorientalrug.com/ckfinder/userfiles/files/sexomevolafobinejaxo.pdf In PDF document text
    • http://kalikraft.com/images/file/jalekanelokebe.pdfIn PDF document text
    • https://nacionalequipamentos.com/ckeditor/uploads/files/punufotuwujalosel.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1d90b4f2a---lowunag.pdfIn PDF document text
    • http://voxel-avocats.fr/uploads/file/matibudebilipi.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/mmj4rnur9hn2p11rr8qat8oo52/fexuzulanarapakuv.pdfIn PDF document text
    • https://abicecream.ru/ckfinder/userfiles/files/77515651001.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ccc6b5291e7---9946404520.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/68f57b3810e67d051ed139042bfad718/78176879808.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/d336f0a2d0f145eaebfe9f491ef5204b/76049083495.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/denesujapemikevexelej.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/133650b950fd50a32448ee11300596cd/kigiwinibovenog.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/2vrhh2omvsh798ts2dg452n4dn/darokut.pdfIn PDF document text
    • http://kapli74.ru/upload_picture/nudiluveko.pdfIn PDF document text
    • https://arch.ua/ckfinder/userfiles/files/11975780248.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/87578070207.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608078855295b---daliposejojako.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/6c48ba626fa60492fc89e2f2f1a94d77/44923046382.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f4dc9e942---zogutagijakiguxafuvomar.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/7f21ec2e176a89eb6bfc622b032beb11/28507507650.pdfIn PDF document text
    • https://otartufo.com/ckfinder/tartufofiles/files/51674639510.pdfIn PDF document text
    • http://morebricks.com/ckfinder/userfiles/files/gezesivonil.pdfIn PDF document text
    • https://wita.lt/images/files/xuliwavufake.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=how+can+i+download+marriage+certificate+online+in+tamilnaduPDF 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_off0000e9b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B9 10828 bytes
SHA-256: b3c33bb89b94438f1e01d4c957c449936a3d549072f67378b5eb44858174166f
font_01_sfnt_off0001027e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1027E 16856 bytes
SHA-256: 665c2910c19db49154e4d6a11d51e99e512bc3bf1ae89cb5bf42f5f6040db8bb
font_02_sfnt_off00012e6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.