Malicious PDF — malware analysis report

Static analysis result for SHA-256 33ad5aec0a955d35…

MALICIOUS

PDF

90.1 KB Created: 2021-07-01 12:19:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 5ff4928ce6bd1ef97823158a154c1402 SHA-1: 28c7e4e4e62f74fd64a2c7f83d66497d7e8a2806 SHA-256: 33ad5aec0a955d35d3c6ff134fce3bdc15521186889752581d6bdc0a194e866c
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised CMS uploads and disposable domains, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the nature of the document as a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://xn--bren-mgenwil-gcbf.ch/sites/default/files/fck-uploads/file/30320057744.pdf In PDF document text
    • https://otelnamore.com/wp-content/plugins/super-forms/uploads/php/files/632be8140c24ea47685c5ae2c566804b/tisetevinuk.pdfIn PDF document text
    • https://alternatifhosting.com/calisma2/files/uploads/womuzatokojuxajatunenokon.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a9cffaf3050---13339888287.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/38add00ebc9ffeac488e340ff90b6552/xiregikigesarofutoxepig.pdfIn PDF document text
    • http://cyuanmei.com/userfiles/file/fepowapopuned.pdfIn PDF document text
    • http://pajurioverslas.lt/ckfinder/userfiles/files/mumujumunobud.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160867ff991fd3---95493430114.pdfIn PDF document text
    • http://nexxosrealty.com/userfiles/files/kogajekomarimadidobatiw.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/oan3c188khmjn7g5i7tlenv2m1/79983382762.pdfIn PDF document text
    • https://egyiksem.hu/uploads/file/rerepikopilunigab.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/82003960852.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/65454547505.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/d8aa601ce683714360f76acfba25f6f7/66429534085.pdfIn PDF document text
    • https://hotel-la-licorne.fr/userfiles/file/72060227457.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/f3eac4372e1d42a708bae5360f89e0e9/faromokabunusof.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/4a757c3d77e6df433674687bd543d6bd/kefovigisikegofu.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/zomabufamitajagodozalepod.pdfIn PDF document text
    • http://choinka4x4.org/cms/files/file/pipilofemigugip.pdfIn PDF document text
    • http://adhdesign.de/userContent/files/20210607122017-lukaxerezaxeluzubov.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fef030edb8---78491327640.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=long+square+ombre+nailsPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F0 10696 bytes
SHA-256: 52d03d946f7f1bccc1cf23ce389d751c6f4cc2c8832a4e4d140b5b6bce9c7445
font_01_sfnt_off00010d1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D1C 17388 bytes
SHA-256: 4c6982099f45174a5d52233db1c45afd89770d7ac7666226a1018ef823f7eb0d
font_02_sfnt_off00013adf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ADF 1684 bytes
SHA-256: 72bda604c77ca771a1a14ee35dc8ff354b9f00ec81e947fe844e91f3a29209ee
font_03_sfnt_off000142e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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