Malicious PDF — malware analysis report

Static analysis result for SHA-256 9518b27e437b7b76…

MALICIOUS

PDF

86.7 KB Created: 2021-07-08 00:27:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a95c29a0660a8875ecaaabba2b33932a SHA-1: fee95b635ac64bd5f76a7808a7ccc1758a1be63d SHA-256: 9518b27e437b7b76d760c8a2daa127345a6dbedb549df2af5691ab0bc2e880de
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to WordPress installations that appear to be hosting malicious files. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' suggests these links are hosted on compromised sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a1188bcedf8---wufufanazapujujexupi.pdf
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16077a48bd2f5d---4435261082.pdf
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/d2q8m6etm7v9mmhuo4ff648f9n/fosuvaxomunu.pdf
    • https://evermoral.hk/upload/file/1624428917.pdf
    • http://ridgefieldpark1967.com/clients/3/39/39eebdc8797e30ee23d4fd57d071fd44/File/81034746788.pdf
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16092d262a669f---zedanidez.pdf
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba4639017ab---zavexajasewuxez.pdf
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4baafe399b---vuritapakaj.pdf
    • http://jikaramen.com/uploads/files/5978675047.pdf
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609849f897e08---ketox.pdf
    • http://tipiland.net/upload/file/39500915792.pdf
    • http://eprdel.cz/userfiles/file/76884404463.pdf
    • http://progetec.org/userfiles/files/3789647968.pdf
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/f549efc5198a7da92a676d4de3fea48d/48153423669.pdf
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/vugjpdqpfknc290rrd9cij7ntb/72667210519.pdf
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/b72ed4853eea5c43c0f2de57b64682b4/makifewilonefiximut.pdf
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc884cbc42---jobulisisiweberezip.pdf
    • http://vds-construct.pl/userfiles/file/gavenaxuzunojupidoxikimen.pdf
    • http://mini-garden.ru/userfiles/file/gexubigefag.pdf
    • http://reanda.com/jingkelun/userfiles/files/20210617072810.pdf
    • https://biocoils.com/img/file/kodepor.pdf
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/3424ff6b8cfecb3e6769661cd976f42c/mumetasimit.pdf
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f553e960e2---81392241861.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=the+great+gatsby+chapter+2+quotes+with+page+numbers
    • 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_off0000edec.bin
92b8ab22f5e5e542dae0ed42fcb7f5e0175d474e53cc46e20cb74ea14ba3c838
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDEC 17216 bytes
font_01_sfnt_off00011ad9.bin
9d2b3289f4567977b31a709232440111ff76ce0fbe10a37dbc37bb6b55ee1368
pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD9 11444 bytes
font_02_sfnt_off0001355b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1355B 16792 bytes