Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3120f7e6656576f…

MALICIOUS

PDF

83.1 KB Created: 2021-09-16 21:21:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7ac5e56b9b397a0b945003ba8bdf3262 SHA-1: 02b633a63ee8442f86c444ee61f91312f0a3d8f9 SHA-256: e3120f7e6656576fbd5f8eccaae2dcf9482d003144838301909f20bea755c139
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to lure users to malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or trojan payload delivery. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the malicious intent of distributing links across various potentially untrusted hosts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://queure.ru/uplcv?utm_term=all+unblocked+games+66 PDF link annotation
    • https://bya-ingenieria.com/ckfinder/userfiles/files/88231613303.pdfIn PDF document text
    • http://f-okinawa.com/img/tmp/file/fapeberufotawepiwu.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef44002c8f---26386110930.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/a2c2ed14b0bdd7603a1c2164af757d7f/wasekaxilugedap.pdfIn PDF document text
    • http://wefocusdesign.com/upload/files/befexazexinenimidifabu.pdfIn PDF document text
    • http://skkouty.cz/ckfinder/userfiles/files/2728539674.pdfIn PDF document text
    • https://seltec.io/images/uploads/files/zupezefanevud.pdfIn PDF document text
    • http://kangshi-you.com/uploads/files/202109102304347586.pdfIn PDF document text
    • http://evaemlak.com/userfiles/file///46228574474.pdfIn PDF document text
    • https://tootooair.com/FileData/ckfinder/files/20210906_6CDB84E03253F268.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/98618018435.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/fixovununifugodinize.pdfIn PDF document text
    • http://kamnitikamini.si/upload/files/wizaxizubepuwetodatoge.pdfIn PDF document text
    • https://www.willmarshelter.com/ckfinder/userfiles/files/26598109700.pdfIn PDF document text
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/zokuwosemepobifuzuwajodun.pdfIn PDF document text
    • http://n-production.com/upload/fckeditor/file/98858751657.pdfIn PDF document text
    • http://vetsnab32.ru/userfiles/file/wepefakitopuxak.pdfIn PDF document text
    • http://xy-interior.com/uploads/files/202109111633109225.pdfIn PDF document text
    • https://guineaservicesproviders.com/gsp/files/65014484649.pdfIn PDF document text
    • http://www.dereformasenalicante.com/archivos/files/50432863235.pdfIn PDF document text
    • https://ladangmimpi2.com/contents/files/mekegizemariwimofapev.pdfIn PDF document text
    • http://ledseoul.com/userData/board/file/sugupaw.pdfIn PDF document text
    • http://afro-safari.com/upload/files/32631774052.pdfIn PDF document text
    • http://lex.tj/img/file/28069011832.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/56c7343ab204812463a8c36134ba13ee/zomege.pdfIn PDF document text
    • http://gpe-el.pro/ckfinder/userfiles/files/72240747831.pdfIn PDF document text
    • http://neoclassicalmansions.com/uplds/file/gifupenobanub.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_off0000ddef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDEF 10904 bytes
SHA-256: fa78afc5cf2a2efe6527715cf1a285af9000a70fe42795afa67a787cad4b18b7
font_01_sfnt_off0000f6f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F7 18576 bytes
SHA-256: 5a5562620177333e4269271fc9a69737f56f2a29f1325c7e285e2e9d37a519df
font_02_sfnt_off00012635.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12635 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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