Malicious PDF — malware analysis report

Static analysis result for SHA-256 c18ff6be76d4faf2…

MALICIOUS

PDF

81.5 KB Created: 2021-09-15 18:52:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9b1e2c4542b19eb080458e6028cddb63 SHA-1: d1bfc87a0f9e498d57b1cbfccaa8592c9b546d6c SHA-256: c18ff6be76d4faf2deb3ea5cbead1d5c902efd3ff21245793b3a3564ef871ae5
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV and an ML classifier as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. The presence of numerous embedded URLs, many associated with 'link farm' or 'compromised CMS upload' heuristics, strongly suggests an intent to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 https://chcial.ru/uplcv?utm_term=how+to+use+screen+recorder+on+android PDF link annotation
    • http://www.sas.edu.mn/ckfinder/userfiles/files/wopiwisakeb.pdfIn PDF document text
    • http://yanartekstil.com/firma/files/xowaninenuxojitakalujuve.pdfIn PDF document text
    • http://geofer.eu/userfiles/files/63884092313.pdfIn PDF document text
    • http://telegid.tv/userfiles/files/28540070976.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/lusifolem.pdfIn PDF document text
    • http://aeon-dev.com/uploads/files/202109120127236740.pdfIn PDF document text
    • http://morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613689f7405f0---tusawupekanaro.pdfIn PDF document text
    • http://jr-bang.com/uploadfiles/20210906211258.pdfIn PDF document text
    • https://egf.tw/test2/images/file/vefetujagawivi.pdfIn PDF document text
    • http://mirutte.com/newsfiles/files/jaxukuwasov.pdfIn PDF document text
    • https://mfdesign.hu/files/file/kesuresutorogukewe.pdfIn PDF document text
    • https://www.theknowledgeonline.com/files/lib/ckfinder/userfiles/files/werirezafokadijexe.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/dagokexafagutul.pdfIn PDF document text
    • http://abwingstop.com/uploads/files/kunujakuw.pdfIn PDF document text
    • http://uchid.com/uploads/file/babulumebuzira.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/c47b8021a5a9d42b2ab2921e5b458657/muxirukopumewizu.pdfIn PDF document text
    • http://wwm-quanta.com/upload/files/lidiwigipusemotunef.pdfIn PDF document text
    • http://zzfcw.com/file/fkimg/file/vajotesalonojenovaf.pdfIn PDF document text
    • http://maremania.net/img_pagine/file/73228140385.pdfIn PDF document text
    • http://hastensandbreakfast.nl/userfiles/file/xotasiwidexunenutukaj.pdfIn PDF document text
    • http://cascinamana.it/userfiles/file/81262697091.pdfIn PDF document text
    • http://zzquansu.cn/d/files/29276866853.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/o8ibgfk4gjjj1momb2n4aj3snf/dunoxovupunodumos.pdfIn PDF document text
    • http://imobilestore.de/userfiles/file/10141647720.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16134fa421a7a3---68289658632.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_off0000da5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f26f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF26F 17900 bytes
SHA-256: 04f25746dd8678651da02175c5e723dcfdc023ae6346c7d013f7e43f52029610
font_02_sfnt_off00012066.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12066 10492 bytes
SHA-256: 190b4bae1870bcb821d8251a83fac5ec7e238c22328e1a9f4855e3ec69aba4f5

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