Malicious PDF — malware analysis report

Static analysis result for SHA-256 5793e8ff64abe085…

MALICIOUS

PDF

85.2 KB Created: 2021-09-08 03:30:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0a96175bc7c038e4f0b6bf375737e62e SHA-1: 0d3b34249ae9d7545135d204030bed670e1e22b2 SHA-256: 5793e8ff64abe0856292d62156bfce3d4a6247c111eb1d18bcb01da71561692e
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a remote-support lure. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://baheth24cars.com/ckfinder/userfiles/files/99139415055.pdf In PDF document text
    • http://aihyang.com/userfiles/file/najerirusimel.pdfIn PDF document text
    • http://markfarolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zimozizuz.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/cb2c356ef0b785fdddb8224561e6f281/janulewilogisegizowazulel.pdfIn PDF document text
    • https://szemvidito.hu/sfwkr/feltoltesek/Images/Image/gefojo.pdfIn PDF document text
    • https://jurad.eu/files/file/43934190571.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/97f1afd85e5dd962c5ab805d2838ebd8/bewibadaxen.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/e5ca7fd60c2728d7f33b04e5407492ae/51002982693.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/60399f5e5c4c5c688578dbf68531ad78/10190909765.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1611fdb63423af---30349994033.pdfIn PDF document text
    • http://anquocrealty.com/uploads/image/files/gefuwapopez.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/hv4v0jsi0vcvfdfhge7sbldm7i/dewedejuvajakulabevaxel.pdfIn PDF document text
    • http://ekonopuntos.com/campannas/file/tedajaxat.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f93dd1997e---zamokarejukemag.pdfIn PDF document text
    • http://maivietnamesecotati.com/uploads/files/sunulew.pdfIn PDF document text
    • https://zoldlepes.hu/userfiles/file/73105897242.pdfIn PDF document text
    • http://tuvanluatdanang.com/upload/ck/files/6089457291.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608c506a9a549---wesexomukarobubew.pdfIn PDF document text
    • http://anpo.vn/upload/files/bokikisusutejukubinade.pdfIn PDF document text
    • https://threadworx.com/thread/admin/uploads/file/42169205348.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/v1onu6jfdfkvpujt4ol8b5qqp3/kutukikejujok.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/8kpoa2jous8p7o9598uo0un0q2/nodolifepusef.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a2693556278---26591254150.pdfIn PDF document text
    • http://malovanesklomh.cz/images/file/91396784293.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=the+bible+english+standard+version+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_off0000e83c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE83C 17524 bytes
SHA-256: e055937def75ef893d291a073e305db62e23d4cbbea270bd8c19db5f4ec39ba4
font_01_sfnt_off000115f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115F0 10944 bytes
SHA-256: 5e3aa97f504e1732b744aa5392cdfcb7e783f487ba65fd1f0c33dfd96338371c
font_02_sfnt_off00012ed2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ED2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1