Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6707acb26ce6a0d…

MALICIOUS

PDF

87.4 KB Created: 2021-06-30 21:50:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4af57fbb3d93df1c0e72b01d71832810 SHA-1: 1f6a2a53f5bec8ce2231e8b911c44d7af35ad9f1 SHA-256: f6707acb26ce6a0d8f2a67f4dc2a23effb7eaa022ef242e37d96cb30b0e24d04
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting it's designed to redirect users. The presence of numerous unknown URLs further supports this, likely serving as lures for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 http://scbczy.cn/up_files/file/20210621_063832.pdf
    • https://chp-travel.ir/data/file/27880388292.pdf
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/9ff45bp0r3c7ne20ti5fbrnl33/lasilasadegufitovozaf.pdf
    • https://studio-september.com/wp-content/plugins/super-forms/uploads/php/files/1cc744d66647adc63fbd2de9178c62f4/90413293460.pdf
    • http://brandnewgoods.net/userfiles/file/25153388143.pdf
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16077813a3d8ee---femaz.pdf
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/a087371c6e7be180990200b716d1e19f/badururogex.pdf
    • https://espiber.cl/images/uploadedimages/file/wuxenuboduvexukabenejike.pdf
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/bi8vmkk9a9lj0le4q2rjkeu88r/savewekur.pdf
    • http://goksirlambinowice.pl/img/upload/files/kijamezopigufu.pdf
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608cbde853f37---16595600965.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a55084e3c81.pdf
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087350bd82b8---67096382382.pdf
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/45e5b77v2h3kosa1qtpo9uum84/zuferaxoxubizujuw.pdf
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/6daa99f94472cfb54c2d76898164a06a/tekolexef.pdf
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/bddbdd65c91aeb283211d1b470a04319/33808962840.pdf
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee480e5c02---71222711749.pdf
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/2f31585ec92826b29eeb86f52b951e44/80294895002.pdf
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160ac6a8da73aa---99655948915.pdf
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/go9fbmjkq60pv2l8p4354fjh4r/jasagulaloravukutetu.pdf
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16081999a73871---luwosesakokud.pdf
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/ajk4lf3tsshms4i2kt504ut0mf/soxojudotiluzuxesimi.pdf
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160781a72a67e6---18262234362.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=relevance+of+rizal+to+the+youth+today
    • 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_off0000f1b4.bin
e465b7f55bc68a27be302572c4347e7af53fffd4a6ebf92e2b2e06becb146f6f
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B4 10788 bytes
font_01_sfnt_off00010a90.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A90 16792 bytes
font_02_sfnt_off000122a2.bin
df3db03ebed438b68d2c9e826d39e431807b411ea9114673ae0e9b9d81a77e06
pdf-font-stream PDF embedded font (sfnt) at offset 0x122A2 16940 bytes