Malicious PDF — malware analysis report

Static analysis result for SHA-256 36774dd5eded3607…

MALICIOUS

PDF

87.5 KB Created: 2021-06-27 20:16:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ad45805cd461a224ca4bbd026856b3ec SHA-1: bd576cfc015ad09fc29537af5f4fccb70d59ce2b SHA-256: 36774dd5eded36076d8931f9695f54025c797a31e619d9c63c7cdb1b16eaa80e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://farmaciasacoor.com/site/upload/file/repukin.pdf
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/b5b4f9c1c7aa279cc74d604b7cc7bed3/54238894028.pdf
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/b002481b6d4c7cbf4dbc8a73ad728c51/gojidorajigojazerewarokog.pdf
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607af4ff3af0a---16488907018.pdf
    • http://taxicityplus.ru/userfiles/file/75512967345.pdf
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/nln6b2rsdgmf8sjotmi0ni5v5k/59965953259.pdf
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/bsbdquulopeosg3kvdq3mjge3q/44106729587.pdf
    • http://liveisagenix.com/ckfinder/userfiles/files/8180808832.pdf
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160bf267f80041---lasegobiwamoludov.pdf
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/hm38lik7vdqlinu0m24ojeju85/22963526391.pdf
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086cce9792d8---xoranenifolotonemezunu.pdf
    • http://manavpublicschool.org/manav/userfiles/file/sumelubur.pdf
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1609e825498127---weremubasu.pdf
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/7b04580fe063e9cb82481fe5cb765b79/8333121785.pdf
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/265fc1d504f31c7135290710ecfadc7b/99279309693.pdf
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/b20a05be380ce0a591990f1d5ac2b5b8/28179724845.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/f91217848a90535b8b48abe8c72deb28/fuxipodap.pdf
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a9adf1a863---42888847786.pdf
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/7dded2c21ca64b9e2456b0f1d48cd57c/58765231870.pdf
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/c6a6c13e46c8a875acb9545a9d7a0653/zunirafejularakafivuwija.pdf
    • http://technoauto.jp/js/upload/files/safobopufatebelu.pdf
    • https://anjingliar2.com/contents//files/72437943702.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=animal+extinction+articles
    • 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_off0000f427.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF427 16792 bytes
font_01_sfnt_off00010c39.bin
93e50ec4ee788276e5b7720d998f0f377cb5527fce39ea1d70454bd7e697b8f1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C39 16856 bytes
font_02_sfnt_off000137bf.bin
84fbc4189f0025f46b9f92f107f12eb86b707957721eef9e7172d6bf63f5d3e3
pdf-font-stream PDF embedded font (sfnt) at offset 0x137BF 10472 bytes