Malicious PDF — malware analysis report

Static analysis result for SHA-256 90c45efd2c86e75f…

MALICIOUS

PDF

83.1 KB Created: 2021-06-26 14:30:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a2c85298068a8a330758effc0f3d75f7 SHA-1: 8c1194f33be206a8dd9d4fa168c3c32519927444 SHA-256: 90c45efd2c86e75f91d0daf7a163bc164fd24e05c1cf589ac810e21cebe7ffb7
164 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a phishing or trojan payload. It contains numerous links to compromised WordPress upload storage and other disposable hosting sites, suggesting an attempt to redirect users to malicious content. The presence of a visual download button further supports a social engineering lure to trick users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://crysiq.ru/uplcv?utm_term=certificate+of+appreciation+to+donors
    • http://arci-mp.fr/admin/File/vitejolipezulusemazi.pdf
    • http://musiclivemarsala.com/userfiles/files/7162626052.pdf
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c966da3c72f---zuwuzelerapa.pdf
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16085dc24dee9a---75855906638.pdf
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/51bd79851d297f892595217b1e480149/5291834667.pdf
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160738afdcc143---mowimirevivizev.pdf
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/6d47900f57171760ef84729299830b2d/30229000626.pdf
    • http://markone-tools.com/upload/files/xaripunagetugemilidos.pdf
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160811e89e54f6---59803385385.pdf
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609269adbbbd8---76564679386.pdf
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/4743114153.pdf
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16076e06b2b5b1---zivawigitowojuwapano.pdf
    • http://polymer-optix.de/userfiles/file/meberopemofoputubolepafe.pdf
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160717416d2e18---newuvikijafiwukonu.pdf
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cacb74588c---watamiv.pdf
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b4f2771dc18---xenumirobidikatezam.pdf
    • http://linuxnewyork.com/draft/media//88994540600.pdf
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/9q4su2p3said7ekk9t0031gec5/86746910200.pdf
    • http://bangkoksolarpower.com/syner_upload/images/files/951109987.pdf
    • http://bezpiecznamlodosc.org/files/file/toraz.pdf
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/16088ee623e028---88767445857.pdf
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/1op3ovk368dnea05m2l09todo2/20792963794.pdf
    • https://aimara-bg.com/userfiles/file/91823482519.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_off0000e1c7.bin
7f2016cdb18873a83334262ac44428972e83426391baf8ecb6e4ccb042ff7648
pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C7 17104 bytes
font_01_sfnt_off00010ead.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10EAD 16792 bytes
font_02_sfnt_off000126c4.bin
df67d6a41724d1037618863682d65ca3e8a5d5312bfcbbecd1f6e368d78a80f1
pdf-font-stream PDF embedded font (sfnt) at offset 0x126C4 10596 bytes