Malicious PDF — malware analysis report

Static analysis result for SHA-256 08d278184cd09ef1…

MALICIOUS

PDF

80.5 KB Created: 2021-09-20 12:54:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 3b3b60bfcb0c4fb1dd7561f27061dddc SHA-1: 73dac0783a5e8484ca552c6ac207f719f361d102 SHA-256: 08d278184cd09ef1f157475d9d31ab98af9743e7b5aff2665aac666035edbd56
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains or compromised CMS upload storage, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://catamma.ru/uplcv?utm_term=quantum+field+theory+in+a+nutshell+solutions+pdf PDF link annotation
    • http://eldmsh1.ru/js/ckfinder/userfiles/files/50719881593.pdfIn PDF document text
    • http://csc0898.com/userfiles/file/20210901185644_tmhwue.pdfIn PDF document text
    • https://ags-car.60km.com/upload/files/7951979269.pdfIn PDF document text
    • https://olterus.com/contents/files/3102288720.pdfIn PDF document text
    • http://lamekatus.ee/uploads/ckeditor/files/daxazuxaganefiwodewisuta.pdfIn PDF document text
    • https://baobiachau.com/luutru/files/sabuberemelomawiz.pdfIn PDF document text
    • http://gachbinhduong.com/upload/file/juxifajikaju.pdfIn PDF document text
    • https://canoe.ro/Extras/ckfinder/userfiles/files/simasisagosekovupegijir.pdfIn PDF document text
    • https://tahuacoop.com/cms_gpadmin2015/sgi_userfiles/userfiles/files/zuxopudidupebovava.pdfIn PDF document text
    • http://kangmeideyiliao.com/uploadfile/file///2021091402172811.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/4mcgidjbr572r4125h68i36edg/kozakirawes.pdfIn PDF document text
    • http://xn--9i1b14lwsg1seumdzsx.com/upload/fckeditor/file/52639321815.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd5c2aac67---fitodikar.pdfIn PDF document text
    • http://kmkonsult.cz/userfiles/file/jamilujapesax.pdfIn PDF document text
    • https://ljlconst.com/admin/images/file/55533255612.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/aabbf8af1524650cf5dd0d3d577ba091/vemitixebutuzibe.pdfIn PDF document text
    • http://prefinancovaniehypoteky.sk/res/file/85149370780.pdfIn PDF document text
    • http://izumrud38.com/ckfinder/userfiles/files/96873469753.pdfIn PDF document text
    • https://comtraining.cl/userfiles/files/sixesi.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/b2743345ccf9558e37ec167bd43d6696/letasi.pdfIn PDF document text
    • https://xn----7sbbg1ddpkdc.xn--j1amh/uploads/files/wibifomumutedatox.pdfIn PDF document text
    • https://cingenito.ca/upload/editor/file/vazofalagitusutides.pdfIn PDF document text
    • http://phongthuyphatloc.com/luutru/files/kijefenaf.pdfIn PDF document text
    • http://bluebirdcanada.com/FileData/ckfinder/files/20210906_3A3DBEF0B631BC6E.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_off0000d048.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD048 11036 bytes
SHA-256: 6056e844d0322ee544e43a3d52ac466f2f34fcab7cb48784ecff02ba5ec80f53
font_01_sfnt_off0000e9d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000101ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101EA 19020 bytes
SHA-256: 70251e53ae2b2e02c3b33e5c0f3919369e4948768bd7a8f282b5196e153af34b

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