Malicious PDF — malware analysis report

Static analysis result for SHA-256 53e1c27024e4f672…

MALICIOUS

PDF

86.6 KB Created: 2021-06-30 04:09:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e34d3a61c02703aef512f069b6b20da7 SHA-1: fc88876f82863d36d279ebd366f3f916c47f179c SHA-256: 53e1c27024e4f6726adc3d28eda54054fd08b3b05f21eff1fffa64fe7e01f582
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm. The ClamAV detection and ML classifier indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and link farm heuristic strongly suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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 https://vate-tire.ru/wp-content/plugins/super-forms/uploads/php/files/d167fa597a2844a2aa026fec736cfb88/5309408409.pdf
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7d390d0bd---24059192552.pdf
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6eed42eeb---titemetopisenejifejiweza.pdf
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/37e972830b1354448220aa6492dc548e/62393764268.pdf
    • http://lezeckastenakosice.sk/upload/files/61011923330.pdf
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/56c94palplr4qu286752ta6184/pabezazexovogo.pdf
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/066ca29f43bf9b58eae76892c72680f2/kevunewodugabomupi.pdf
    • https://topinsolventa.ro/userfiles/file/vunevixesafugugezo.pdf
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/cc0899deb4e30afcee2e31edda6bf7e8/wedugiludoxopumeronejediv.pdf
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/42af9c86c5dbf74ab5d5edfce9e364a6/ridolirirapofigaw.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e26a7c5007---9508716257.pdf
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609ddbd0a1205---gebuvurig.pdf
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/847c30bfc794fbe4f50a26be659d94bc/bapipeg.pdf
    • http://woods-china.cn/ci2/userfiles/files/20210613152604.pdf
    • http://macabrey-luthier.fr/data/Files/50053312517.pdf
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/1h6hc44ubp9ttm3t790td0urhr/gejaduma.pdf
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/9983013eb3f971e0db1f8ecfe8d045bd/kamogevapinogugadefile.pdf
    • http://grapes4u.ca/sites/all/sites/grapes4u.ca/files/gokonilaped.pdf
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/529d32a6304b30f1f27e2b2414e51291/dapelawitifi.pdf
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/ekr05he9edtjvpc4aofll7eqib/wudikutefizusoxik.pdf
    • http://hydrem.ru/images/file/dimagugewonejoravobagusi.pdf
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/588cad228b7e448845ff167fabcb2568/jubesilujetutabusifimu.pdf
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/824130276d89db8c672cb2665581a108/xixogejobelivebonotexop.pdf
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160960a36d217f---89865997436.pdf
    • https://avigailpekelman.com/sites/default/files/file/wamixe.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=hot+springs+resort+and+spa
    • 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_off0000ee84.bin
e8f36dec36c48618e67cf0be354d59e5f20ccc04b8e57c8a39204f4594fb796a
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE84 17824 bytes
font_01_sfnt_off00011cec.bin
27138755bbb1e2c800ef9c1bb58e65bf668a4f93329266fff9ed7036fee2fb88
pdf-font-stream PDF embedded font (sfnt) at offset 0x11CEC 10512 bytes
font_02_sfnt_off000134b9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x134B9 16792 bytes