Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f50e7d82318f6aa…

MALICIOUS

PDF

176.5 KB Created: 2021-09-06 12:37:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: daefe6ba798f3935e2dcdfc26a3c9a49 SHA-1: 0a36a329799230b390c85e17317aa7c2d6e0d530 SHA-256: 5f50e7d82318f6aa9c909b7f07ad89da200d74b2dfb0a685196af1a3bc33d904
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to compromised WordPress upload storage and other disposable hosting, suggesting it functions as a link farm to redirect users to potentially malicious sites. The PDF structure itself appears to be a lure, possibly for phishing or to deliver further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160793ed197a86---49787826049.pdf In PDF document text
    • http://suvagcentr.ru/userfiles/files/18954756130.pdfIn PDF document text
    • http://vyveva.eu/UserFiles/File/lebepebobufazejaw.pdfIn PDF document text
    • http://digivideos.net/ckfinder/userfiles/files/6037915935.pdfIn PDF document text
    • http://quanhoangtsi.com/upload/quangtri/files/vemolajep.pdfIn PDF document text
    • http://sllight.ru/design/img/upload/file/5092016278.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/7cc3a4f28dd1eda355f7cebae055eee7/wefegewiposaponomipegener.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0e8770362---313579900.pdfIn PDF document text
    • http://rentaruedas.com/files/others/sazasesolezo.pdfIn PDF document text
    • https://luxurybaths.marblobaths.ph/app/webroot/img/files/munotusobetezurunidedixi.pdfIn PDF document text
    • https://trimix.bg/UserFiles/File/34406655471.pdfIn PDF document text
    • http://fotografiafrancescosomma.com/userfiles/files/kobutafikufagiruwobuxoj.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/46589581795.pdfIn PDF document text
    • https://vieclamkinhdoanh247.com/upload/files/mopoza.pdfIn PDF document text
    • http://majedalkarkhi.com/pics/file/58810378850.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16121552fde884---70799981316.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2b696cbe2b---75828518116.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/d0c0730c75a98810e36fde34892cb9db/6764164242.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/44437f0b3a53d041dd508b14167b2e62/xudekosoberuw.pdfIn PDF document text
    • http://dailitara.lt/bites/uploads/file/55060245475.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160ecd62226995---dufesug.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/5409f0dca312b632270e2d88c31d28fa/61665289727.pdfIn PDF document text
    • http://scuderieverdina.it/scuderia/userfiles/file/54438725800.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=ifrs+10+pdf+italianoPDF 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_off000251eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x251EB 10484 bytes
SHA-256: 3ff7bdfd1d68b4d7d4536bbf978494c5eaf1dd0b192bcba7d2d6e5ae3012b46c
font_01_sfnt_off000269cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x269CF 19336 bytes
SHA-256: a539cd9359287ddb94357fb193e86728115be86de6c6d9679c42481de80220ac
font_02_sfnt_off00029bf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x29BF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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