Malicious PDF — malware analysis report

Static analysis result for SHA-256 99d531519e32554f…

MALICIOUS

PDF

82.1 KB Created: 2021-09-06 16:01:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 32e8ea43b5afbbbe33836b8364648680 SHA-1: 1526e93c4a39ab3161127451afad8786c6fecfb0 SHA-256: 99d531519e32554fb7393c36eea84b7781935bdfdc5703a2428e313ef7163218
172 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and is flagged by ML classifiers and ClamAV as malicious. It also features a link farm pointing to compromised WordPress uploads and disposable domains, suggesting an attempt to redirect users to malicious content. The presence of embedded JavaScript indicates potential for exploitation and execution of further malicious code.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://weddingdiy.cc/uploadfiles/files/20210602_225532_1555.pdf In PDF document text
    • http://china-miyaco.com/img/file/2021621132548.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/581241bf020ba3542819678644b72546/tosezadivunijikofenur.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b90d819f084---getadajekanogosu.pdfIn PDF document text
    • http://studio5r.com/userfiles/files/mozakelaropix.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a3de9278576---39252891933.pdfIn PDF document text
    • http://garmagostaran.com/Upload/file/jejazupadumirifar.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/ligaravizutakemiwode.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/i7cs2avnhdnfnpd8lg8fhc05o7/47757969085.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/69043392621.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/07/25/file/56440796969.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/7bed1223634d2ba1bcac04bd7bce4752/46938193979.pdfIn PDF document text
    • http://designbeginnings.com/upload/file/pajivepiwod.pdfIn PDF document text
    • https://www.dogandemir.av.tr/paketler/ckfinder/dosyalar/files/bemeto.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/sumezegenovoravefi.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/45188184093.pdfIn PDF document text
    • http://dotbamboo.com/file_media/file_image/file/jugowuv.pdfIn PDF document text
    • https://ecoolteh.eu/galeria/file/loxuza.pdfIn PDF document text
    • http://rivieahk.com/clients/5/51/51325344bd1517f257d6959d5350918e/File/jalujomajulatufitolefonix.pdfIn PDF document text
    • https://hinodanang.com/uploads/image/files/91945383985.pdfIn PDF document text
    • https://ancoraeducacion.com/images/fexuzivunapufibomonis.pdfIn PDF document text
    • http://dispensapertutti.com/userfiles/files/mifab.pdfIn PDF document text
    • http://m-styleauto.com/js/upload/files/xivagepovonex.pdfIn PDF document text
    • https://ancoraeducacion.com/images/jegomukixazadabusavoner.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=brother+kr850+knitting+machine+manualPDF 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_off0000d61a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD61A 11220 bytes
SHA-256: a324d6687a090430d3b2320b3ccb3c4f1a0be10e31f3698e531bc91dace74c29
font_01_sfnt_off0000f04b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF04B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001085d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1085D 19120 bytes
SHA-256: f8ed06bc65035c85b5b548e3330f2556e9e0c62378ea5e84b600ad20bd84de13

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