Malicious PDF — malware analysis report

Static analysis result for SHA-256 64c53e0ee22f3d96…

MALICIOUS

PDF

85.4 KB Created: 2021-07-15 10:43:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4ee1f0aa0a06bd1e3a6cd08130cd4a29 SHA-1: 0549906b3fb8c355c02d8c851e9ca3dda8103189 SHA-256: 64c53e0ee22f3d96a63b385c85290869020926be2b2dd9dcce0d8ea0c84987ed
96 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to manipulate search engine results or distribute malicious content. The ML classifier strongly indicated maliciousness, and the presence of multiple external URIs supports this assessment. No scripts were extracted, but the structure itself is indicative of a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • 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.
  • 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 http://tverzhilservis.ru/foktver.ru/ckfinder/userfiles/files/norirotuzobuxobimadilo.pdf In PDF document text
    • https://corghialberti.it/file/124917962.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/cf94fc9b5c2bccf4027b30102c3ed9f5/72203290489.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af9f69551b9---sapozerapuvuragofiwekiju.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee70f85945a---katajul.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/bf7a12df7fcaa41623059fa26360c328/tizelarogedanuxaw.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/wonuro.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b277df181b---49244881734.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/dumes.pdfIn PDF document text
    • http://4grd.com/cmsimages/file/27718971133.pdfIn PDF document text
    • http://bsp-oblspl.org/ckfinder/userfiles/files/rukidofifiwolefirovevof.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bcc58da956---dolaje.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c1d40ac0332---mutezamexefar.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/3nhl97tcqtiuaupae9lv2h8q21/texukozo.pdfIn PDF document text
    • https://jxloanchien.com/style/postimage/file/bizanafetolenulivip.pdfIn PDF document text
    • http://kammatrans.com/userfiles/files/8880014491.pdfIn PDF document text
    • https://x-software.cz/data/file/metufeda.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/q8u77mm5dj7g5e6nsa6g9n324p/lokomitejolowaxunikobalo.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/dhrqdjotqk1p8vqdfolrs2a4vf/56087923258.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16077f0d66bbb2---89918990035.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/fe1ssvbl2jtof8qs27qb2bhtph/dulepaf.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160c1c01d25565---40559994847.pdfIn PDF document text
    • https://scavilecis.it/userfiles/file/kevonudosepoxabijesogini.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/mobof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=recycling+of+waste+materials+pdfPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010256.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10256 16856 bytes
SHA-256: 59e9d090492be4a945002c272a63ad503e183cee4631ba9dbd948bce296cce45
font_02_sfnt_off00012e24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E24 11208 bytes
SHA-256: ed366cb0c6549be75f11964511ee336a0898888c7c169c56389e91cd0c8e4ddc

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