Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8e19a5461e8d9d5…

MALICIOUS

PDF

171.0 KB Created: 2021-06-13 17:42:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d1a79077b8836a10d97dd2ef2e61da02 SHA-1: 28c901d2ac4ec73537356e75c48b2c6f16662c5f SHA-256: d8e19a5461e8d9d548c5ae683b96347799c4c2b6aefbd30c46180df9c10073b7
316 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File T1059.007 JavaScript

This PDF document employs social engineering tactics to deceive users into performing malicious actions. It presents itself as a Windows update notification, a common lure for installing malware or stealing credentials. The document contains multiple embedded URLs pointing to compromised WordPress sites, likely serving as download locations for malicious payloads. The presence of ClamAV detection and ML classifier flags further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 10

  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://drafthe.ru/uplcv?utm_term=windows+8.1+free+update+to+windows+10
    • https://www.saammohaseb.ir/wp-content/plugins/super-forms/uploads/php/files/24814d7046a4c999d68998ede941a15b/91481707064.pdf
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bd5a3037580---bisedalaxesisagerejizi.pdf
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607e458bf0d47---13637833612.pdf
    • http://arlingtonhigh1961.com/clients/e/ef/ef36f0800c0a5d5a0b00d5ecc8c3c6da/File/devuwadegap.pdf
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/21841185cd6016e8f8c4d2d02e3120d5/64270032031.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/l7dbumdecmh7s17ed7chp1es54/69820623465.pdf
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a04b2baa539---68480553880.pdf
    • http://dabaizhongxue.com/upload_fck/file/2021-6-3/20210603185521501431.pdf
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/b55b093f15b4e686cca405e10421dc7b/rugetonegojapidekemi.pdf
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160b760fd42421---tedop.pdf
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/fb4d8e968350455edcca896348bbf294/80115165157.pdf
    • http://icltindia.in/userfiles/file/fatezapo.pdf
    • http://www.vikingmaterials.com/img/xovujipam.pdf
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ae10956f502---dujasogeti.pdf
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/5154896dc5d060cc27c3e569740bcf4d/32582814925.pdf
    • http://vamaconsulting.sk/userfiles/file/80814856038.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • 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://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00025794.bin
2f5099ec4dafd5ab31ebba0341c3b9c0d217417e943b5c033afdcb330d57f59a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x25794 5412 bytes
font_01_sfnt_off00026a21.bin
672811788f29baf59b8aa6e23e0993b7b0995ca7a5a5541ec4130a98ae4a4e2e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x26A21 11288 bytes
font_02_sfnt_off0002908e.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2908E 4324 bytes

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