Malicious PDF — malware analysis report

Static analysis result for SHA-256 87e1e17339a789cb…

MALICIOUS

PDF

82.7 KB Created: 2021-09-04 11:32:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f1b74db0aae2c1a4fcb54dfb127e7a1e SHA-1: 197dec82efb91a0f4b75f3a700ad0676f47beb97 SHA-256: 87e1e17339a789cb821134002dd454358f30946a4ba21bb682947a25f04e82d2
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised websites and disposable hosting, indicating a link farm designed to lure users to potentially malicious destinations. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. The ML classifier and ClamAV detection further confirm its malicious nature, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ewtch.com/upload/files/48033093738.pdf In PDF document text
    • http://ndc-group.ru/uploads/files/80304963065.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/383e945973fbce397eeff74d423736d8/merediwororir.pdfIn PDF document text
    • https://total-sport.pl/img/upload/files/68001151247.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b33d445f2---gigozunapo.pdfIn PDF document text
    • http://ng-sons.com/userfiles/file/56379181777.pdfIn PDF document text
    • http://cafemsoffice.com/userfiles/files/73989863096.pdfIn PDF document text
    • http://gmkms.net/upfile_editor/2021/files/jefozigijimizif.pdfIn PDF document text
    • https://tese.in/ckfinder/userfiles/files/jagibotuserafanijurafivum.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/4fbb67dbe544e6ca43f033da24b5ba8b/37383591866.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/d323b6c8a8fa90bbb7792be2bc7a230e.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/1759ed42b1d80e7a8d58293f606f1e49/rojimarujomobudakez.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/41093196067.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160799bfb4a50b---56078562032.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b51859ca62e---82401013887.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608e7c96354b7---27558903218.pdfIn PDF document text
    • http://serdceprirody.ru/userfiles/file/90207768794.pdfIn PDF document text
    • http://absigorta.come/file/vigikofoze.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9d4932e8b---jezexagiwelewaf.pdfIn PDF document text
    • https://dalnoboy.com/data/filestorage/upload/files/96176874898.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/50906606375.pdfIn PDF document text
    • https://www.bmo-agencement.fr/ckfinder/userfiles/files/58520510939.pdfIn PDF document text
    • https://kingcarmotorista.net/uploads/files/59108722490.pdfIn PDF document text
    • https://jordanadams.com/ckfinder/userfiles/files/raguto.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=copy+text+from+pdf+to+word+freePDF link annotation
    • https://tes-sys.com/uploads/ckfinder/files/20210720/16267671421841.pdfIn PDF document text
    • 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_off0000e0f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F5 17020 bytes
SHA-256: 65786fd42dad8301afd898207460341b03224946ac133a3e1751e25f2fa2a488
font_01_sfnt_off00010d1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D1D 10420 bytes
SHA-256: 441933d0eb19c259562c1b427854b1a7b1ed9e91364648491328b8fadb46e26e
font_02_sfnt_off000124de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1