Malicious PDF — malware analysis report

Static analysis result for SHA-256 09de6637c346d40b…

MALICIOUS

PDF

83.6 KB Created: 2021-09-19 18:58:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0c43c5358709060e923b17a40399f5b0 SHA-1: a6d8d601491c5ffcef9d9b7600fba44a39982bbe SHA-256: 09de6637c346d40b6cf20f959c39419aa20d7a70883062ec6f47f0cda5f5371c
156 Risk Score

Malware Insights

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

The sample is identified as a malicious PDF by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to various domains, some of which appear to be compromised CMS uploads. The presence of 'utm_term' parameters suggests a phishing or tracking intent, likely to lure users to download further malicious content or engage in fraudulent activities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • 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.
  • 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=westland+mod+apk PDF link annotation
    • http://iiiemjobs.com/FCK_Editor_Images/files/didepikisuxoduferivoge.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141f1bcef664---61952887553.pdfIn PDF document text
    • http://desiaussies.com/ckeditor/uploads/files/bazigewagavurixopazujazu.pdfIn PDF document text
    • https://novahealthclinic.ca/userfiles/file/59280434240.pdfIn PDF document text
    • https://living-stone.lu/userfiles/files/46398731737.pdfIn PDF document text
    • http://nieruchomosci-swidnica.pl/userfiles/file/7985755044.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/gafifu.pdfIn PDF document text
    • http://chamdure.com/DATA/files/8226659208.pdfIn PDF document text
    • https://art-eria.pl/mandarynka/pliki/files/vekibo.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/dfcefd6da20c79b3c0306594c719ae6d/betofobedozujuwal.pdfIn PDF document text
    • https://montpellier-business-plan.com/mbp/upload/images/images/upload/ckfinder/zipasodoparokozerotolaz.pdfIn PDF document text
    • https://gruntbudowa.pl/files/file/45280783324.pdfIn PDF document text
    • https://cleartunemonitors.com/ckfinder/userfiles/files/64214636775.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202109120022589102.pdfIn PDF document text
    • https://taptigrihnirman.com/singhania/downloads/file/77052012421.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/978566e55574ade13a6eaf9bc15dba0a/xobilonipoxi.pdfIn PDF document text
    • http://thriftstorewebsites.com/flash/thriftstorewebsites.com/file/givadapitidobomiwizidatil.pdfIn PDF document text
    • https://mai-avto.ru/upload_files/file/45974245450.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/d9c602bb1f8ce86f2aa4bfb239c27124/91786850285.pdfIn PDF document text
    • http://visusmarble.com/images_upload/files/88167647296.pdfIn PDF document text
    • https://www.acta-mobilier.fr/ckfinder/userfiles/files/8941758341.pdfIn PDF document text
    • http://incomingmakedonia.com/files/files/fajokijezoxud.pdfIn PDF document text
    • http://chineseclothingonline.net/File/temujalasopivelabufuweb.pdfIn PDF document text
    • http://homeopathyhongkong.cn/files/7660666219.pdfIn PDF document text
    • http://sinproval.it/userfiles/files/patofepezulapipatareruj.pdfIn PDF document text
    • http://pro.ovh.net/~tribuene/images/banque/file/6698388731.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_off0000e3f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC0C 10448 bytes
SHA-256: d9ca9636812bf9dc3ce8b226aef94505bf2a604597510a71d1f4fc49b6490bf2
font_02_sfnt_off000113ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113CA 17288 bytes
SHA-256: a93a6626e6e8f00c75b9d1c24107f58f2a88e0132abe05f20cf75e3e768f190d