Malicious PDF — malware analysis report

Static analysis result for SHA-256 aaa7ab249bc69c39…

MALICIOUS

PDF

198.6 KB Created: 2021-10-06 00:35:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 82d61b8289448ee09ac7dfbcb8d3c09f SHA-1: 2882dd7fda3f180e2cea485a88bebca452436bad SHA-256: aaa7ab249bc69c398cb81f7471acd5ee40a444872489cb7dc433bb34607b9744
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one heuristic specifically identifying a link farm pointing to compromised WordPress upload storage. The PDF structure and embedded URLs suggest it's designed to redirect users to malicious sites, potentially for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9743

Heuristics 5

  • 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.
  • 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://wastran.ru/uplcv?utm_term=oxford+new+pathways+class+6+literature+reader+answers PDF link annotation
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/j7ht9bgeo914n0e70k4ai2s4ik/7654126567.pdfIn PDF document text
    • http://homelife-superstars.com/image/files/jakuf.pdfIn PDF document text
    • http://cokhitienvuong.com/uploads/files/12413813377.pdfIn PDF document text
    • https://incense888.com/uploads/files/202110060514456726.pdfIn PDF document text
    • http://valosagoskincsesbanya.com/upload/file/82169953214.pdfIn PDF document text
    • https://sanvexe.vn/webroot/img/files/5464016717.pdfIn PDF document text
    • http://jujucuisine.com/userfiles/file/45849206395.pdfIn PDF document text
    • https://nhatngudongkinh.com/upload/ckupload/files/kiduv.pdfIn PDF document text
    • http://musicincw.com/fckeditor/userfiles/image/36036240087.pdfIn PDF document text
    • https://i-intelli.com/ckfinder/userfiles/files/45249000806.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021092115472259255.pdfIn PDF document text
    • http://engcaphone.com/_UploadFile/Images/file/vafafik.pdfIn PDF document text
    • http://idominjazz.com/fckeditor/userfiles/image/40188704534.pdfIn PDF document text
    • http://xn--80aer5aza.xn--7-4tbj3b.xn--p1ai/ckfinder/userfiles/files/39400766546.pdfIn PDF document text
    • https://matfreklam.com/calisma2/files/uploads/86701361983.pdfIn PDF document text
    • https://noglehoma.com/ckeditor/files/files/72179836341.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/n5b3596htjn329jhim78h0mv86/43095918294.pdfIn PDF document text
    • http://health-bridge.in/upload/file/zabuwifexenu.pdfIn PDF document text
    • http://ausafe.net/images/art/files/zawexagatimulizu.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16138fc957f65c---wolud.pdfIn PDF document text
    • http://funkyspa.net/ckfinder/userfiles/files/fesetovikogipiv.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613fa3cc40e2c---susojonuwaraponefiki.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/jovamuj.pdfIn PDF document text
    • http://soosanfix.com/upload/fckeditor/file/vexabiwulafetasanus.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/70qgbnjal06asrui9eujrdu2vk/xozezib.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_off000299ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x299ED 11312 bytes
SHA-256: 85f3b0d377f9afd0e4f8f0d6f790e088db21ad4465c45cdfa3bf0629c445c361
font_01_sfnt_off0002b493.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2B493 24100 bytes
SHA-256: 31d970912b2b054d5042fa8d98d48c92559f4f2ec9d2b2ad5cab9ddc8d86130f
font_02_sfnt_off0002f2ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F2EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1