Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4d2f9dad90860f4…

MALICIOUS

PDF

80.1 KB Created: 2021-08-28 21:50:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 15e5bcf21ede7a5fdd690261b9208097 SHA-1: 5906191f4a6a35b40c57a5ae21834094bdaa61d1 SHA-256: b4d2f9dad90860f4ec4bd6d578c7746b2e6a9ec5e02620736d4aeff4e303d065
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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 http://avtokit116.ru/!upload/files/sumefokewuzageli.pdf In PDF document text
    • https://kanat.com/upload/ckfinder/files/vepufuparijematefubobugo.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077910b564cc---pimeki.pdfIn PDF document text
    • https://visionbrindes.com/admin/fckeditor/userfiles/file/tevafapike.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f1d25893f1---roweroxidexinamujejija.pdfIn PDF document text
    • http://emons-verlag.net/testarea/cwsCMSlight/media/files/tajari.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f759a64f0d---zameraroloji.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16096690bc397b---julunez.pdfIn PDF document text
    • http://soepcentrale-dekeyser.be/userfiles/file/talumalifikunazat.pdfIn PDF document text
    • https://sweetburden.com/upload/users/files/33605851144.pdfIn PDF document text
    • http://tutek.eu/userfiles/file/34459929477.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/86234010161.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608fdd1bda486---57578415969.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160772d2fc0554---21409541776.pdfIn PDF document text
    • http://wamer.org/userfiles/file/21812380876.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160df86faab0c1---bukij.pdfIn PDF document text
    • https://electroagro.es/pub/files/pakitilibe.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/6909899289.pdfIn PDF document text
    • http://cnzgks.com/userfiles/file///94532104749.pdfIn PDF document text
    • http://el-master.ru/userfiles/file/fukevesodugizexap.pdfIn PDF document text
    • https://magerp.org/upload/files/7137621349.pdfIn PDF document text
    • https://www.leadercaravans.com.au/application/third_party/ckfinder/userfiles/files/98031604825.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=indian+railway+simulator+game+free+download+for+androidPDF 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_off0000d35c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD35C 10948 bytes
SHA-256: c721570eb7903e531924d8586ba4ed622836db9a08f56089fc47498c003b456c
font_01_sfnt_off0000ec98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000104aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104AA 17244 bytes
SHA-256: 0328be0ab50677a1328e9626411510f63a43c637f755beeb988539342bf577bf

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