Malicious PDF — malware analysis report

Static analysis result for SHA-256 2822af6f397c6947…

MALICIOUS

PDF

86.2 KB Created: 2021-09-17 03:51:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: cbb829b4c9357f3412ec554a0fe024cd SHA-1: 4b2affc3bb62b1885b741a74eb6ba55cea5acb40 SHA-256: 2822af6f397c694756d82193eb3c971533899c0c9b8d24044aa86e43ac5a610a
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm pointing to various PDF files hosted on disposable domains, a common tactic for distributing malware. The ML classifier and ClamAV detection strongly indicate malicious intent. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests the document may be part of a multi-stage attack, potentially requiring a password to decrypt a payload, which is often used to bypass gateway scanning.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://archism.ru/uplcv?utm_term=oggy+run+game+download PDF link annotation
    • http://nwatchonline.info/userfiles/file/36101387931.pdfIn PDF document text
    • http://bptramptour.pl/files/file/90949501633.pdfIn PDF document text
    • https://xuanhongkhang.com/upload/files/90420848282.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161332b1a483c1---narizisagas.pdfIn PDF document text
    • http://felixefontesadvogados.com.br/ckfinder/userfiles/files/vuwaterudufipameki.pdfIn PDF document text
    • https://www.bnbtravels.com/ckfinder/userfiles/files/nepujukuragotetolebukomu.pdfIn PDF document text
    • http://ebbers-schilderwerken.nl/uploads/files/83270879980.pdfIn PDF document text
    • https://tannhatviet.vn/upload/files/30104688960.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/lekagefukofukebusupibosog.pdfIn PDF document text
    • http://pc-driver.ru/userfiles/files/zutarobunolelimi.pdfIn PDF document text
    • https://360clothing.in/home/www360cl/public_html/uploads/images/files/94521741535.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/zivutivebu.pdfIn PDF document text
    • https://www.newhorizonscrisiscenter.org/ckfinder/userfiles/files/lepukelizagaga.pdfIn PDF document text
    • http://cablexconsulting.com/Upload/file/lesuxetamerif.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/174b14acfb8b868d19591e82f82e477f/figiwibinokalukuzokisow.pdfIn PDF document text
    • http://xn--djr00fsyfv0o5qgy9u.com/filespath/files/20210916092001.pdfIn PDF document text
    • https://biserica-izvorul-tamaduirii.ro/files/nebosetegofitipepugolegu.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130ccba756f2---19053591986.pdfIn PDF document text
    • http://evaemlak.com/userfiles/file///jijizagureniverurefefawu.pdfIn PDF document text
    • http://robedecreateur.com/img/files/vagosepujo.pdfIn PDF document text
    • http://tahi.hu/ckfinder/userfiles/files/75997977479.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613724391d0c2---juxofibujasi.pdfIn PDF document text
    • https://htcpost.vn/vietpost.vn/img_content/file/woxonewuzevipabefunito.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_off0000eabd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEABD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000102d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D4 10556 bytes
SHA-256: 40b6e7e4a386fedf790457632291e35876ec325e69694e0781afe045d2898f20
font_02_sfnt_off00011abd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ABD 18992 bytes
SHA-256: 8eb18e86c61eb9d0240268f2e90d0d1caafb99b4d29dab281bec13c806783f7b

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