Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f36f340051aebd1…

MALICIOUS

PDF

83.9 KB Created: 2021-09-07 03:57:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b456eab358f68ff790d51855863c50dd SHA-1: 3ea4af5c167d85bf164adbe201e0b96b23c392ca SHA-256: 1f36f340051aebd1df1ce6bd8abe1797dceb0adc9f57cd7b3cdae97d69b103cb
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised websites or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent. No scripts were extracted, but the structure and URL analysis point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://jjkxmy.com/upload/files/202108271229469591.pdf In PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/gbjueme6o7c8cshh5tni7q6h87/tawexubipovame.pdfIn PDF document text
    • https://tidurmalam.com/contents//files/64411758800.pdfIn PDF document text
    • https://ip-kamera-rendszer.hu/ckfinder/userfiles/files/91999732720.pdfIn PDF document text
    • https://taechoclub.com/FileData/ckfinder/files/20210628_CC250A7943F8650F.pdfIn PDF document text
    • http://jszl-rolls.com/filespath/files/20210816165027.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/a92b43ff6ccc3c087ec4a9e77f33487c/mekajonizivilaviguwa.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609de9b07824b---kawukugaxami.pdfIn PDF document text
    • http://koala-al.com/d/files/geferifitotexudub.pdfIn PDF document text
    • http://gachbinhduong.com/upload/file/10052549255.pdfIn PDF document text
    • https://iominneapolis.com/wp-content/plugins/super-forms/uploads/php/files/7eaed08ed21b1f5655cdc377965fc4c8/79858632649.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606fcf9fde397---zubojasafudoxojabe.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160f3fc5e9923b---13599956820.pdfIn PDF document text
    • https://gadesign52.com/uploads/files/202108170325377098.pdfIn PDF document text
    • http://sequirk.ie/userfiles/file/degomixatim.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/28d9d9da9340a3092f79d378fb7b588d/38287656378.pdfIn PDF document text
    • http://technology-mp.it/userfiles/files/71380964557.pdfIn PDF document text
    • https://jyapa.com/jhuoyue/uploadfiles/59291437757.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/5rrsiu1tfoa64au3lj30jam3io/fibatodanumaze.pdfIn PDF document text
    • http://stevis.cz/files/file/lagez.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1607d68cb00988---24820798145.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/37729525323.pdfIn PDF document text
    • https://annekienlen.fr/imagesfile/geviveloroxa.pdfIn PDF document text
    • http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/41096629736.pdfIn PDF document text
    • http://1-champagne.com/blog_images/blog_/file/vugawotikorodolimulugi.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210614045453.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=terjemah+fiqh+manhaji+jilid+2+pdfPDF 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_off0000ddc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC5 19784 bytes
SHA-256: ae059ef5b617c81cb5599cc71a6cb11a042b78e66848384cafe1a47a1e95039c
font_01_sfnt_off00011161.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11161 10736 bytes
SHA-256: 1078f0126f0526ef844f9969fa29c8355a21ddadfa26fc9c2f88cd5d14cf5c4e
font_02_sfnt_off0001298b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1298B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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