Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d45bf4e23d1cecb…

MALICIOUS

PDF

86.5 KB Created: 2021-07-14 02:16:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e2156d8ec4be9272b6e21405c4458e55 SHA-1: 0dfa55544bab59af55eaa05991439f62092cc672 SHA-256: 3d45bf4e23d1cecb230ec162e67f134f66e00e98c208f54f780fa00aec51a4af
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm or phishing lure. The presence of 'cmd' tokens in the document text, combined with the PDF nature of the file, suggests potential exploitation of PDF vulnerabilities to execute commands or redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://philabc.ru/uplcv?utm_term=cyst+on+my+ovary+after+hysterectomy
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/8cutvqrh7fdnb1fj2d97phhfon/46131105414.pdf
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607c14fad3a3e---jidivivoxajubowuk.pdf
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2165b87cc---ritoliziguvibal.pdf
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dca136a3dc4---xamemiwanojalemaf.pdf
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/k6udt5cmdk1f58eh0p4s9smgb4/zerogiregeruvenegejarexov.pdf
    • http://curry-box-deluxe.de/userfiles/file/zavuridapumulinagiridar.pdf
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/2106a35b28242a571f5fa2630f076c2c/pesojilotigomaj.pdf
    • http://nirmalamathachurch.org/cms_uploads/image/file/34744846045.pdf
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16096146c31b95---vekanavuvupefu.pdf
    • http://posekatzahradu.cz/files/file/19209328451.pdf
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ce5c4ab0b6e---sajobegib.pdf
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b42ce02ac37---5249727101.pdf
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/14682820437.pdf
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d26620ca1---matifelatazutonimula.pdf
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/so70lpba6l60kea2fb7r0mpfob/79690914884.pdf
    • https://hagepoorter.be/files/files/84371198641.pdf
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/fq8et55hd0ak42arc9bggvjf27/jupakegugirilavexide.pdf
    • http://youandisagenix.com/ckfinder/userfiles/files/80673670129.pdf
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0305770f78---biziloluper.pdf
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/4e65f6c112a8ac308ac3d4445d7d7328/gixina.pdf
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/1dbe76f993c58035cb77ba365cad6902/bajubimabopujoka.pdf
    • http://tj-1970-50yr.com/clients/e/e8/e8fccb6fb94f20b6ca4375945b3939e1/File/23080182216.pdf
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160dac114eeb8e---niwiginaxiwufenifesutov.pdf
    • https://greenfuturevietnam.com/Upload/files/vedibabegefofuwumanazileg.pdf
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4d0a3c185e---87634562703.pdf
    • https://medlineplus.gov/ovariancysts.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f140.bin
ef3fe9c163c00f8fd808f94287f47d60ccf44f61f3289c8c6de1b0d0237e246a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF140 10676 bytes
font_01_sfnt_off0001099c.bin
8996895712e17d8e8f04d49d270a39c7f2a17cdb2ab7e94d1991a781dc7d46a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1099C 16540 bytes
font_02_sfnt_off00013482.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13482 16792 bytes

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