Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1e869e7054f2acc…

MALICIOUS

PDF

96.7 KB Created: 2021-09-08 10:05:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 86881fbc50506f18073d0c68d03b8a1b SHA-1: 9e955902799848e94b3aad588f0b503e3862803e SHA-256: c1e869e7054f2acc2f01aabd7b9c143a83d2c3c0ba2901f21c2222c787594ad0
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan delivery mechanism. It contains numerous links pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of multiple external URIs and link farms indicates a strategy to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pistant.ru/uplcv?utm_term=spoken+english+classes+pdf PDF link annotation
    • http://tipiland.net/upload/file/42809986368.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6978f5dfed---45928637881.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160876faa0ab44---suketoz.pdfIn PDF document text
    • http://pusheng168.com/uploadfiles/20210717090057.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/ad9cdf1fd21321ab68b43d139e5716f8/lenif.pdfIn PDF document text
    • http://donauwell.at/userfiles/file/36264767323.pdfIn PDF document text
    • https://valubil.com/public/uploads/cms_file/cms_files/20749256572.pdfIn PDF document text
    • http://jun-travel.com/userfiles/file/tabimonufakuwuto.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/regezuj.pdfIn PDF document text
    • https://masihpt1.com/contents//files/49205402435.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/24435655662.pdfIn PDF document text
    • http://www.lukoilmarine.com/ckfinder/userfiles/files/fevazejevobibuvefofegewa.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a117f1622fe---72763432336.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/nepupabuwapiborina.pdfIn PDF document text
    • http://headlinesdinerla.com/uploads/files/bomuxewuwexadoviji.pdfIn PDF document text
    • http://staceyasp.com/UserFiles/file/59350453178.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/nidorovuwinuwisojedux.pdfIn PDF document text
    • https://economiadecomunion.net/ckfinder/userfiles/files/vimowo.pdfIn PDF document text
    • http://maychaybocaocap.com/app/webroot/uploads/files/34647884038.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/95183338385.pdfIn PDF document text
    • http://roanfamily.net/clients/0/01/01b24a6c100194bbc8678883f3cd4a53/File/18090339042.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/5bd2f84be83355fb0848257667147844/repokolobemimin.pdfIn PDF document text
    • http://elesi.eu/fichiers/files/dinozofejexanorus.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/79059647940.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_off00011329.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11329 10868 bytes
SHA-256: 52e194c1326f67bda86c94e555b4c2f3fe7fc4d989639eb8ee228aa920405485
font_01_sfnt_off00012bf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014403.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14403 19020 bytes
SHA-256: 7a29eb106012f0ce84bb5341d77131a0bbc88f669f7c7286240e78422076edb2

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