Malicious PDF — malware analysis report

Static analysis result for SHA-256 b83aa8fcbcd86afb…

MALICIOUS

PDF

86.8 KB Created: 2021-06-28 16:42:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a5345329c19ba24f746a83e6eea71d10 SHA-1: ffdbc41b9a1ed8c0abce41d0a3861601edaf937b SHA-256: b83aa8fcbcd86afb3df2409f7d0821b3e91017419dacce7265daf5a65d0c0ffd
216 Risk Score

Malware Insights

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

The PDF document contains multiple URLs pointing to compromised WordPress sites, suggesting it is part of a link farm designed to distribute malicious files. Heuristics indicate the document instructs users to enable content and provides password details for an archive, a common tactic to bypass security controls and deliver a payload. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • 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://huntic.ru/uplcv?utm_term=word+says+selection+is+locked
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbd2bed932---kiduxebonivipokumozi.pdf
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/3e41gg7n9au4lnn2ep7tkg25v9/92061398795.pdf
    • http://beepost.vn/upload/userfiles/files/pedigafikoka.pdf
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1609044be7802f---23287507277.pdf
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc954b57439---sulivokekofenofozupojef.pdf
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/b965cd98b002707d0b2e994556645be1/liraguzolotesana.pdf
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f47de22e88---81435750446.pdf
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/da3fbd75a744d0497eed35751b463309/gilemegufabamijubuvejozat.pdf
    • https://galerie-louise.be/userfiles/files/65339122622.pdf
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/e549be98b6892b7a7bcd93dfcfd2d656/miwekufegogivodonul.pdf
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/907a5613aa2ed892c0bd35f6bde84aea/39910945741.pdf
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160766164d3545---jogapibenal.pdf
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b26cb5bdf9---62747939482.pdf
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/03c5eab4fffc638d48a3f5bf39ba5472/jofujogiwumir.pdf
    • http://english-life.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607584adab94e---548902160.pdf
    • http://carroll1975.com/clients/4/4e/4e2b018d07aaa5a30c3e4fca1c7a8df7/File/volosujojitifuzi.pdf
    • https://abe-rdc.com/userfiles/file/wamemisutefarojelufuwejis.pdf
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606efb6327aae---veseletisamiwusew.pdf
    • https://thefencedocumentary.com/adminfiles/file/givizixifijudofutumog.pdf
    • http://brilspa.ro/userfiles/file///kamufe.pdf
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609cbd6a1e299---15865270057.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_off0000ee66.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE66 16792 bytes
font_01_sfnt_off00010678.bin
15efc940186ea45a9f2c050d9f7e1a361e9bf4fb26ce7b2cc4c62afbcd6e03f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10678 17532 bytes
font_02_sfnt_off0001347e.bin
c14fcca238a149156dbabcb7cf693826ba1905fe27fd4e2b67dbe788ff64b0aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1347E 10564 bytes

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