Malicious PDF — malware analysis report

Static analysis result for SHA-256 0277988000db166a…

MALICIOUS

PDF

84.8 KB Created: 2021-07-08 10:19:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cd9b3b255a4e612dc072cfb0dd5cccc6 SHA-1: 5defe690a6ac17842f3bad675261a7c25caa21c7 SHA-256: 0277988000db166a88970cb9ed0e09b9a6cbb2e5a5fa21c4d9f20ec9c471c0c0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm for phishing or malware distribution. The presence of external URIs and link farm heuristics indicates an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 https://queure.ru/uplcv?utm_term=3+ton+flatbed+truck
    • http://walthamclassof1985.com/clients/5/52/52060312c10aa816a718e90a19a6a7a1/File/45728849826.pdf
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/3767e62e8421e165a5ab95d794aae5d3/rafanifulezakajirezufa.pdf
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983cbc76722---jeladimagepirilowoxijume.pdf
    • http://chalappuram.com/userfiles/file/1892764534.pdf
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/6876cffe62e646b0c6932d5329e3489e/zusuxanamawajuloxutaxirel.pdf
    • http://acecaalcoy.com/userfiles/file/80714891267.pdf
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bdb2b1e080c---98813891782.pdf
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160815c5300fd8---27703110413.pdf
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/j0mdfsrbt1pe0rgjgp7cr0sbg5/sabenejodeg.pdf
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160af679f04da1---wusefopigivopimomusuku.pdf
    • http://zonweringbelgie.com/ckfinder/userfiles/files/wanuzavunipuv.pdf
    • http://creativeindustries.ru/uploads/userfiles/file/99639223607.pdf
    • https://egca.fr/userfiles/file/42201333028.pdf
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b96e83b4923---50523253475.pdf
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca7e19b886---99257729789.pdf
    • http://www.abcklima.hu//data/editorfile/57436927699.pdf
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/fe71h5rjd78nq441ftk2ue2rvs/rijemavajiginazasar.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608b2cea2582d---96298995750.pdf
    • https://marljivo.hr/userfiles/file/koxodekesavusamidepim.pdf
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/ca732a679b26dcbd94c85218af827ea9/vererijalujagexuvajof.pdf
    • http://esipro.fr/userfiles/file/51109100319.pdf
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c3e43c7dbf8---roduwabeziz.pdf
    • 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_off0000e93d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE93D 16792 bytes
font_01_sfnt_off00010154.bin
bb1414503186b7cac6c744ac55ef0531e7efa941ea461e8bc2c4fd094b58a801
pdf-font-stream PDF embedded font (sfnt) at offset 0x10154 10616 bytes
font_02_sfnt_off000119bb.bin
6765d5ff0ea95eafdd6ccb9f073d809c9eec90849811084d82cfcf44a4dcb270
pdf-font-stream PDF embedded font (sfnt) at offset 0x119BB 16976 bytes