Malicious PDF — malware analysis report

Static analysis result for SHA-256 a85730c321abfb4a…

MALICIOUS

PDF

68.1 KB Created: 2021-09-19 21:09:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 56dba48a9a1aef56a88472e6e6625b68 SHA-1: 189378af5c2830250114b40aacf271a63687edc0 SHA-256: a85730c321abfb4a804c9e6b3bd8a86d8525dfe89647e4c2cc42c37a49350c09
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload storage or are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely responsible for redirecting the user to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://smidgel.ru/uplcv?utm_term=4k+android+wallpaper+download PDF link annotation
    • http://eortak.com/img/fck_temp/file/36786407735.pdfIn PDF document text
    • http://vector-luczak.pl/new/fck_user_files/file/zifixilufaviz.pdfIn PDF document text
    • https://xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/giferemivetamugavezomaw.pdfIn PDF document text
    • https://livres-arts.com/ckfinder/userfiles/files/gikexupazoviw.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/h547u5lnde8eq1r3p3k43l1o7o/sudokupuxuzovapoduz.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/gidenelifoxafagokijaj.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/7918048394ef2028f312035871ab6094/mezefawavipojuledoleteg.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/060006107490.pdfIn PDF document text
    • http://wwsm-us.com/files/file/rofati.pdfIn PDF document text
    • http://bloodfaces.de/attachment/file/28439407683.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/wuzinefoxijuken.pdfIn PDF document text
    • http://iccjsc.com/images/uploads/files/kivawutefilobo.pdfIn PDF document text
    • http://qianlong99.org/ckfinder/userfiles/files/92469008518.pdfIn PDF document text
    • https://maintogelonline.info/contents/files/54665497590.pdfIn PDF document text
    • http://jiuxingchaoshi.com/uploads/file/041911533872.pdfIn PDF document text
    • http://solarwindependence.com/ckfinder/userfiles/files/temulamedikep.pdfIn PDF document text
    • http://www.jasolasia.com/image/upload/File/voruwemixegafujazu.pdfIn PDF document text
    • http://cafesezony.ru/fck_editor_files/files/rinidema.pdfIn PDF document text
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/zerugemeton.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/vosuja.pdfIn PDF document text
    • http://dawahcity.com/userfiles/file/nesofugi.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161457160a79d1---paxabakofivosinolu.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131a4c4472ae---61637171941.pdfIn PDF document text
    • https://fzclicks.com/demo/files/editor/file/kurewuzine.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_off0000af9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c7b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7B2 10280 bytes
SHA-256: 9e8bac946d75ad03317a9df8307313405c69084a9cf25d9644d809300ed4bd5b
font_02_sfnt_off0000dee8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE8 14424 bytes
SHA-256: cfad89877bd3163526685fb74d6efc30822d40af224c8fc1f6647e6feb91cee7

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