Malicious PDF — malware analysis report

Static analysis result for SHA-256 120a22e7f124baf1…

MALICIOUS

PDF

87.0 KB Created: 2021-08-03 02:52:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: e8c757fff5e6b992b194b4bd232b8bda SHA-1: 2376e2ee1d893e079c15512a42940a0762216ca9 SHA-256: 120a22e7f124baf113038b4b53d5b748fe98669ec22fdb4d4ac4ea70bc6af1ba
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a ClickFix paste-and-run lure. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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 http://kengosushionlineorder.com/uploads/files/kavubotaka.pdf In PDF document text
    • http://aromamahabaleshwar.com/ckfinder/userfiles/files/dezeduzagakepogok.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/ml8bht32b9508a3gsrv8r615i6/99869232320.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a40dc0e8c9f---40316399148.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/v7a44i22p6nuatvedip84dm3gf/56552207104.pdfIn PDF document text
    • https://electroagro.es/pub/files/joneleg.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/lev8p3n1krae7qkm9kv1f4jq6k/79428905127.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/2085626375f5026b4f278a3d6f274c80/lomujujowimasuvuv.pdfIn PDF document text
    • https://shieldtech.cz/ckfinder/userfiles/files/tafezijun.pdfIn PDF document text
    • https://btcauction.vn/hinhanh/file/24644824223.pdfIn PDF document text
    • http://msinternationalbeautypageant.com/clients/8/8c/8c0f0497d7166b07b5568c04be8084ca/File/kekidukolovufa.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/9aff761507f4478be5cb92a62ed8a616/73123849931.pdfIn PDF document text
    • http://china-hold.com/UploadFile/file/20210704213517840.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/78832502785.pdfIn PDF document text
    • https://voyagerf.ru/wp-content/plugins/super-forms/uploads/php/files/208c32aea1848ad0bec85aacee599f02/litikorebatogab.pdfIn PDF document text
    • http://seidels-mineralienwelt.de/images/uploaded/file/jisejafopafujigapewekeki.pdfIn PDF document text
    • http://esebtekstil.com/resimler/files/fopavijenesovidik.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/visezudivugagojen.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607041cf7f7a6---dezoxixavopipune.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c90c4a12d08---29835012265.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/pajavavegapesadobibade.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/gpm8do3mpc3s1j7fkfsr6dln4q/fedawexamopefa.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd14bae471---giweramuminabomijonek.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/26343473322.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160a51d0ee66a7---36078156908.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/bda9e80b287aafa08a2eabad9f026109/25678279814.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+open+cd+drive+on+dellPDF 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_off0000f0f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F8 17680 bytes
SHA-256: 9c52560412e614696684c9c665c47f19eb5ad38c89c2d2d7b579259099b08ee4
font_01_sfnt_off00011fa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA6 10320 bytes
SHA-256: a2d5e8eaf16acfd9feebe688ed73a0413690aa81e9b8f432cbc44df8c575a2dc
font_02_sfnt_off000136fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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