Malicious PDF — malware analysis report

Static analysis result for SHA-256 e21dbb278e1b11f7…

MALICIOUS

PDF

75.4 KB Created: 2021-09-10 10:23:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: b215e9e1101be3923eba1b80f59a934c SHA-1: f18f4345faff14c6ebfd7fe7bea54184b27001fd SHA-256: e21dbb278e1b11f7b1860b30c4c2063d6f12c5c86f7352c64c3fa3a074bf2e63
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 CMS upload directories or disposable hosting, indicating a link farm designed to obscure the final destination. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery through these links. The document body is heavily obfuscated and appears to be non-readable content, further supporting the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://happysmilecard.com/uploads/files/momudasir.pdf In PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/9c7d87eb73e8df3397ade2e27af4a878/jipelesusalatexewawo.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613af6417a9e0---xogidelopivutaxe.pdfIn PDF document text
    • https://traveletrust.com/basefile/traveletrustcom/files/80823115706.pdfIn PDF document text
    • http://kdekdyjak.cz/data/96694558702.pdfIn PDF document text
    • https://istanajpdua.com/contents/files/63998457865.pdfIn PDF document text
    • https://bahispesinde.com/gnc/veri/_files/fadixuket.pdfIn PDF document text
    • http://gurukripapublicschool.com/userfiles/file/gulinexejigoxurefuwij.pdfIn PDF document text
    • http://wine-paraphernalia.com/files/winep/_repo/file/pomotewomurigatijipuwe.pdfIn PDF document text
    • https://bongkartuantakur.com/contents/files/vizikelanidobapuxuron.pdfIn PDF document text
    • http://7166867.ru/ckfinder/userfiles/files/15109506953.pdfIn PDF document text
    • https://imagebrandstudio.com/userfiles/file/72578281987.pdfIn PDF document text
    • https://dhins.com/testingsites/advantage_aviation/assets/media/file/6844398887.pdfIn PDF document text
    • http://ping-property.com/user_img/files/riribu.pdfIn PDF document text
    • https://dehayemek.net/upload/ckfinder/files/kufodapagobitoropujefije.pdfIn PDF document text
    • https://www.auto-ecole-acm.com/ckfinder/userfiles/files/ruwojeziviw.pdfIn PDF document text
    • http://pathtojanna.com/userfiles/files/wijog.pdfIn PDF document text
    • https://transmar.biz/ckfinder/userfiles/files/72623046255.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/fuxituxajenatifegaxig.pdfIn PDF document text
    • https://birutelorasin.com/contents/files/gakarumikikixejizitobuti.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/026bee71918ba0c2aece4a1d19382ac0/linirexupesiwe.pdfIn PDF document text
    • http://plnjl.com/userfiles/files/66362191243.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/161347fb521bad---juvifagiruduz.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/870bd8cc06429e6ea60385c969a73200/limanemoxuvufalowuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=shawn+ashmore+the+followingPDF 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_off0000c1c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d9d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D2 17452 bytes
SHA-256: 9e29b59cbcd392a991a9a46acf11a93065daae804dcbcced7efa7cdc22a50c9c
font_02_sfnt_off0001078b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1078B 10820 bytes
SHA-256: 9ee8fd8a8694ef13052ecf9c44bba4e613d4d11d21541305799a302a6c99fe92

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