Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1f24693629736d6…

MALICIOUS

PDF

86.9 KB Created: 2021-07-31 20:29:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: 80a05ddeb755c404f8d2482d691b1486 SHA-1: 4fb99d91bf77ce8b81b93c5be4515ac06b51f49b SHA-256: a1f24693629736d6ca66d282f59be90a9a899d95281e219fbc2ecdf93df67671
164 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many pointing to other PDFs hosted on compromised or disposable domains, suggesting a phishing or malware distribution scheme. The presence of a 'download' button lure further supports this. ClamAV detection and ML classification strongly indicate malicious intent, likely for distributing further malware or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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.
  • 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 https://inwebjor.ru/uplcv?utm_term=disk+drill+for+windows+price PDF link annotation
    • http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/50735688700.pdfIn PDF document text
    • http://kwartetproforma.com/userfiles/file/sutunaderunugibubulavonu.pdfIn PDF document text
    • https://magiccat.pro/ckfinder/userfiles/files/30742561268.pdfIn PDF document text
    • https://hoavily.com/uploads/files/16865548431.pdfIn PDF document text
    • https://gangwontaxi.com/FileData/ckfinder/files/20210626_ADAD07F09E77F3B3.pdfIn PDF document text
    • http://emannsltd.com/userfiles/jopotazexinunurexopozarig.pdfIn PDF document text
    • http://ehsclassof88.com/clients/7/7f/7f6c4973f16106f9a1f2948091db50b4/File/nalinuv.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/f7533a32f8886d8c21d58c5d9e2f3f85/botum.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/32264909100.pdfIn PDF document text
    • http://eshop-kocicinadeje.cz/files/file/tawubifosinobilaloxo.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d9b498ca3db---44481455651.pdfIn PDF document text
    • https://thuanxuongmonmb.com/admin/webroot/upload/image/files/dekotexosojetokibenul.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/ls6f7j2bf9hisga6m50rfks5g7/xarivuju.pdfIn PDF document text
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/7681633655.pdfIn PDF document text
    • http://doks-films.com/pcms/content/file/39156951482.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/68489091816.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/gejaxekirexatowisel.pdfIn PDF document text
    • https://markeishahall.com/wp-content/plugins/super-forms/uploads/php/files/2210a8a33876a2ad7b7269e4a4e2409a/zenolix.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/fb6f447fdf349e67bc90297738ced97e/82313027531.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/31ec2f176f5414fc8a30810601f9980e/fedupefa.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/48012004990.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/16090fb487d4e4---27524085242.pdfIn PDF document text
    • http://praxis-greve-polley.de/web/editor/files/54859162649.pdfIn PDF document text
    • https://bompentax.com/quangbasanpham/app/webroot/upload/image/files/fuwisemoloxu.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_off0000efb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000107d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D0 10532 bytes
SHA-256: f83a6c3d576ec20ed79fe5e9b1f1663655c5b133bddfb9a8c46e066028d1182b
font_02_sfnt_off00011fec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FEC 17232 bytes
SHA-256: cdaa6def9e474b078946197021c9b5e5a76a43b68c9611dce75e963be693875a

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