Malicious PDF — malware analysis report

Static analysis result for SHA-256 511f8ca8a3041a7b…

MALICIOUS

PDF

111.7 KB Created: 2021-07-05 04:06:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 647543aea80c3c33899b412ade6a3d42 SHA-1: 88d79ee34c613fd1c3cba0447343332d06991623 SHA-256: 511f8ca8a3041a7bd52f3c7d041d88e2aada9deed99df95ba94bc4261cc16a0f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The presence of multiple external URIs and link farm heuristics confirms the primary attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9666

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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=answer+in+different+languages PDF link annotation
    • http://acecaalcoy.com/userfiles/file/savuwuroruvumiwida.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4524a503f---webikulolexubopopavuxodux.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/1oii4kh2h5iui1rtvs4al08so2/99379477688.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c62415a70e4---31026226598.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/4ee98457b5e82c25f8538c0e8fc6818f/jafigijotiri.pdfIn PDF document text
    • https://mbbs.hr/files/96202079873.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/petopalofizeseranukupo.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/tpvmki7i0svft9uc4rgl5vcp0q/lawubabisi.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/fms73f9lp2s2kd5s99g4nrnbvb/makojivujijiz.pdfIn PDF document text
    • http://brlairport.com/images/file/89106340121.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/ced0c2104e7cfef659aabfe843735019/visitapomamukuno.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/202163099259696.pdfIn PDF document text
    • http://tnslib.su/userfiles/files/riwaw.pdfIn PDF document text
    • http://gotween.com/userfiles/file///71536913109.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/daeaf6974ced84c2c70a07b626c1db22/kefisikonidowojige.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2891ea258---sefesoni.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b20d077f829---81830117406.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba221216f81---29550936477.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8fc593f91---wabijuxiwo.pdfIn PDF document text
    • https://www.anandtirth.com/wp-content/plugins/super-forms/uploads/php/files/5rk0ims6ck75isu4da83tg1753/xixekabepirisinabifuweg.pdfIn PDF document text
    • https://autoroman-service.ro/imagini_ws/pezoxiwulovopikaw.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/m2igkdkcf5hpuk0jgj03f01a4s/talopiwesunemi.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/fibfaa8dgvka5iem61dfs8vddd/gifezu.pdfIn PDF document text
    • http://senseoftourism.dk/userfiles/file/59682525853.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f28437c9aa---zuxugejetanusimunajum.pdfIn PDF document text
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/ec28c6ceae5bce8da25f111b213286cc/tekikosizibeb.pdfIn 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013b79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015386.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15386 4236 bytes
SHA-256: ece20edf9c3db8d831a9c29df96798b15d8c619e093cc85a6a72c332d4d21a09
font_02_sfnt_off000163d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163D2 21484 bytes
SHA-256: 070854fb508ea9300aa29003e7d648f3f7abf8b86f0ce052f618f419e036f3cf
font_03_sfnt_off0001988a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1988A 10576 bytes
SHA-256: 2d0ef4c37a904dc3c6291cc1a9be4df22169e814f98898b62be8eca943b1e598

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