Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5d53fb78891993d…

MALICIOUS

PDF

172.8 KB Created: 2021-06-17 12:45:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: a42d74eeeb82c78090067f6e58945ee2 SHA-1: 7c3884b26907529f6a448c251b0afaa3bb19c286 SHA-256: e5d53fb78891993d8d02981fd078d6f223750280b1480d883be90b4d4fcd167e
316 Risk Score

Malware Insights

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

This PDF document employs multiple social engineering lures to deceive the user. It directs users to install a browser extension or plugin, a common tactic for malware delivery or credential theft. Furthermore, it explicitly requests sensitive recovery secrets, such as private keys or backup codes, which is a critical indicator of a phishing or scam attempt. The presence of numerous links to compromised WordPress sites and disposable hosting suggests a broad campaign to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 10

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://philabc.ru/uplcv?utm_term=how+to+turn+off+auto+update+in+windows+10+pro PDF link annotation
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609041c87e7b6---ridusepumasitipipupi.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/rebisewatoxeni.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/wotakemesew.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/zixizipujalutiwedonigato.pdfIn PDF document text
    • https://wodepcb.cn/uploadfiles/files/39295472734.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b94e92c4309---zegejozafakire.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/90100939660c303fc641b0.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/4r24mkkt0gqb7np5l45uhske07/92787382577.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16083406e346b1---28438936968.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b6e7a241bd2---78420273599.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/45424319187.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/gnlc2lbqumu484ko7qs2pbup29/pafavotizubarewiwotibilu.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/f001df44faf5f4033128fb4fc622e4ec/lunurapatalisu.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16086ab226ae6c---75538796651.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/0ff5e9b01a0ccf0fa4b7c428b752ec94/68438179656.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00026c19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x26C19 5248 bytes
SHA-256: 34ac129dc44a6854738995eed8172cdc5d81b7e928824e6b704ec94aaebe1848
font_01_sfnt_off00027e17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27E17 11552 bytes
SHA-256: 8109e21b1a46c8893fd40d53c0c63404646d126a9f9a14664211fd647772dad2

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