Malicious PDF — malware analysis report

Static analysis result for SHA-256 f44cd0803f0a79b5…

MALICIOUS

PDF

82.9 KB Created: 2021-08-18 15:36:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4e676944e9648165fc1c7e3b171add64 SHA-1: 2945b238afa7d43808fb38adb7c7c9d492a2b8a9 SHA-256: f44cd0803f0a79b5c5e68419bda8db8712f790763a8be204315ce878f486aa48
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://cochu.net/resimler/files/76151984228.pdf In PDF document text
    • http://lamelove-zakryti.cz/userfiles/file/kuzelesekunaxupufekeda.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095b8e07d573---82398340514.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/0eafd9e97a3443d4f8f1c2e612e52f34/wabapirufev.pdfIn PDF document text
    • http://zentrumok.com/userfile/files/28509369230.pdfIn PDF document text
    • http://alumcity.ru/userfiles/file/57957905986.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610b44e7aaeca---66403212139.pdfIn PDF document text
    • http://xn--90afqerdlt1f.xn--p1ai/admin/ckfinder/userfiles/files/nejibuwimi.pdfIn PDF document text
    • http://fonnepal.org/userfiles/file/lejogul.pdfIn PDF document text
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/4952571103.pdfIn PDF document text
    • http://blow-w124.com/js/upload/files/pitedubowivodi.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/c5qdou4o4j6fo7k5ef9dq079ok/sevaginatoxebagetizufi.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4e99c4168b---82330974714.pdfIn PDF document text
    • http://kapalishakti.com/ckfinder/userfiles/files/zigazenagoj.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1608572d1148d7---xinukejowumofodagufije.pdfIn PDF document text
    • http://jngf.cn/files/file/welexofewokowizi.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160829347b3502---purubelopigemesidedet.pdfIn PDF document text
    • http://atlonnuri.org/UpLoadImage/editer/files/zoxupapebuxu.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/jotenekumemukim.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609c98e29f717---59243473334.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160830877586d5---37974374426.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=kane+chronicles+graphic+novel+book+2PDF 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_off0000dec4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC4 16780 bytes
SHA-256: 887c7df90b0a612baf4160b6c68932ec32e561c893d7c5506c535ae940917081
font_01_sfnt_off00010a7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A7A 10964 bytes
SHA-256: 772da9327c9afa4479bd08ebd458daecde759dea6035b2ba71f3f4d5561604c0
font_02_sfnt_off000123aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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