Malicious PDF — malware analysis report

Static analysis result for SHA-256 99d53b85b9c343c6…

MALICIOUS

PDF

72.0 KB Created: 2021-09-23 21:31:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9c659b879c68775786b91cd076ac819c SHA-1: 3bcdb151c2a0b5a26ec9bf672e8e13c45c8d4c50 SHA-256: 99d53b85b9c343c681431f16af779facb3ce75614d743398b154a60e2d39c71e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS upload storage or disposable hosting. These links form a link farm, a common technique used to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://garglob.ru/uplcv?utm_term=i+love+you+sarcastic+quotes PDF link annotation
    • http://geyikkimya.com/userfiles/upload/file/85652105427.pdfIn PDF document text
    • http://sambometal.com/dataroom/file/puzasejivef.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/noxadasemibepopotebek.pdfIn PDF document text
    • https://suma.ca/upload/editor/file/46165415142.pdfIn PDF document text
    • https://www.thic.net/plugin/ce1/ckfinder/userfiles/files/88834510218.pdfIn PDF document text
    • http://ebd.su/UFD/7623/files/42843336036.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/6c1dbbc77024401e771469cb517d55b6/88513980036.pdfIn PDF document text
    • https://garmin10.ddbseven.cl/userfiles/file/sezirokirigubopis.pdfIn PDF document text
    • https://nazragame.com/calisma2/files/uploads/ruxabogumifik.pdfIn PDF document text
    • https://noddy.nu/images/file/93457141158.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/63a2c03021b9bd7432f645e7b0962870/fokubakar.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16147f6ad53cea---bejikotesofosodilute.pdfIn PDF document text
    • https://inprovitargentina.com/ckfinder/userfiles/files/disotikotanisajo.pdfIn PDF document text
    • https://acrgruppe.de/userfiles/file/katarebowipafuva.pdfIn PDF document text
    • http://nature-revive.org/files/file/dapabidekofevotid.pdfIn PDF document text
    • https://testpensija.bankai.lv/ckfinder/userfiles/files/buwolomuzinuboki.pdfIn PDF document text
    • https://nhatngudongkinh.phapluatvietnam.com/upload/ckupload/files/kesofexizojonarududu.pdfIn PDF document text
    • http://kondicionery-domodedovo.ru/upload_picture/file/79005728405.pdfIn PDF document text
    • http://rayanchem.com/d/files/rirenadajo.pdfIn PDF document text
    • https://youkuvpn.com/upload/files/69724824832.pdfIn PDF document text
    • http://tvsatkrosno.pl/userfiles/file/daxuzelibeviloj.pdfIn PDF document text
    • http://yejida.com/userfiles/file/41314506386.pdfIn PDF document text
    • https://mami-m.com/Uploads/userfiles/files/9409586997.pdfIn PDF document text
    • http://hanaelectric.com/userData/board/file/48917760922.pdfIn PDF document text
    • http://burningspearmarketplace.com/js/ckfinder/userfiles/files/41548628451.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b681.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB681 16524 bytes
SHA-256: 1c35cc140412a0c71868c361ec4c4bf898420df5998f0fc0735e5a55eb30c121
font_01_sfnt_off0000e0aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0AA 10496 bytes
SHA-256: 1bb172056ee33711dbdf405c4e7c3f5ec6edb4810d0f78223acdc0ab5037fa4f
font_02_sfnt_off0000f8c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.