Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d0937724057e3aa…

MALICIOUS

PDF

79.0 KB Created: 2021-07-30 10:52:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d64044dc52e0a169f444b3563ba262ae SHA-1: 35911f84cd465e4609a927c25c4fab9dd6803628 SHA-256: 2d0937724057e3aae6c887f2967520e0416d2c87ac866308089abee5be0e0753
154 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to WordPress sites utilizing the formcraft plugin for file uploads, suggesting a link farm designed to distribute malicious content or redirect users to phishing sites. The presence of external URIs and link farm heuristics indicates an attempt to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7754

Heuristics 5

  • 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
  • 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.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983e9c0a8dc---60636245912.pdf In PDF document text
    • http://iburgisidimarsala.eu/userfiles/files/19648866769.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1ada76491---28689401162.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d48d5cb033---98054726535.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16072ec3d46a31---bemunuzak.pdfIn PDF document text
    • http://bhsclassof70.com/clients/a/ac/acf0241a72c9eb28a719a759cf8a4748/File/97650317299.pdfIn PDF document text
    • http://mientaytourist.com/uploads/files/givizoruxiwi.pdfIn PDF document text
    • http://opusbiz.kr/data/editor/file/180767025560fc41f5a1f05.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c1a8c9a447---12550509908.pdfIn PDF document text
    • http://4yoga.by/pics/files/25404166058.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/d83bf800cb365d20534596dc430fb2ee/gelowenawulikig.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/476cdc4567565a3fc3ec252f001892d0/29172708672.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/90876575697.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/misuzejotaxolasitus.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160d8e843c36dc---wawinatikomami.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16094ab961eb34---93857761682.pdfIn PDF document text
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/nozogoro.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160c76acea4b38---wapewigugenepazoxalu.pdfIn PDF document text
    • http://changwontour.kr/FileData/ckfinder/files/20210722_386DAEC6509453C1.pdfIn PDF document text
    • http://preciz.com/uploads/wysiwyg/files/guzinerofikedemuboti.pdfIn PDF document text
    • https://socohoteldanang.com/uploads/image/files/71774364997.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5b14786aa5---woforimizosuporanum.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/4635a70dbbc443b42fb072c700e08dee/77425737576.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=evaluation+addition+et+soustraction+des+nombres+relatifs+4emePDF link annotation
    • 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_off0000dece.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDECE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E0 18804 bytes
SHA-256: 86bfe7afb80e5e15018cb944e238b632f6499ca997a278e927489db38f4a2f19
font_02_sfnt_off00012696.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12696 11004 bytes
SHA-256: fd4b18e12b2ee9cdd8c175e6f8960c404d242d99efe1aad82efef226e928e39c