Malicious PDF — malware analysis report

Static analysis result for SHA-256 71b27ab42c33236d…

MALICIOUS

PDF

79.7 KB Created: 2021-09-25 16:08:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: b026b98b045893d70374e428d1edc465 SHA-1: 7394675cb71f0b59b9fbe704fce5df88e57f31d9 SHA-256: 71b27ab42c33236d8bc7c64d83fd542309967fffe8b78e510c1194fed96805e3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a large number of external links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • 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.
  • 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 http://thuduchouse.vn/pics/file/xavakefalitadudusi.pdf In PDF document text
    • http://kasintorn.com/images/upload/files/19689412241.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613b63c3d5c87---gexuvogurozi.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/82325541742.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/cc2jcjalgrlrper71c7ns7m50m/63788342661.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16147ba837bfaf---piwupasoviguvelokub.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b83cbcffa5---fowituramunumi.pdfIn PDF document text
    • https://szelvedojavitasmiskolc.hu/files/files/jedoxaxobif.pdfIn PDF document text
    • http://www.northern-japan.com/image/upload/File/masowutalutadunal.pdfIn PDF document text
    • https://rosewoodcity.org/nbloom/fckuploads/file/sexenovakajokige.pdfIn PDF document text
    • http://matchedtubes.de/userfiles/file/remisulop.pdfIn PDF document text
    • http://eg-connect.com/php_codes/Scott/VieauAssociates/code/userfiles/file/77172200808.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16140f3a751660---kirubuxugemokiz.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/16148512de60c5---zawogesidutuxivi.pdfIn PDF document text
    • http://epoch-making.jp/js/upload/files/45233480321.pdfIn PDF document text
    • http://alconsprom.ru/ckfinder/userfiles/files/bixivapedobudade.pdfIn PDF document text
    • https://partnermind.cz/images/files/mikipepevawekil.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1614f1432ddfe7---sokowapajoriwido.pdfIn PDF document text
    • https://sdudyogtechnologies.in/ckfinder/userfiles/files/3115620485.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161497278b68f6---pedik.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/mumipoloxunewebinopoxekeg.pdfIn PDF document text
    • http://photopuzzle.net/userData/board/file/kodukit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=kung+fu+panda+3+full+movie+download+in+english+480pPDF 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_off0000c32f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC32F 11568 bytes
SHA-256: f8776c38d050dfa52696133b99e373611af8c3f20abf1c4534ac2c5109885dfc
font_01_sfnt_off0000de52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f664.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF664 21728 bytes
SHA-256: 67b6f3b45115a87886a7fa966ab741e259a9fda4b6a5d7643dfb7fc064c3eadb

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