Malicious PDF — malware analysis report

Static analysis result for SHA-256 71a5245c77a473a0…

MALICIOUS

PDF

89.7 KB Created: 2021-09-08 05:38:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 134109c2f69e52c559a93939a02818e1 SHA-1: 758c0d5f842dab62e30ff4dd2b5a2f36477d10e3 SHA-256: 71a5245c77a473a00d799be68c72d0c7f9782e8736dae8a6d940d8efbe6c5d05
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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.
  • 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://orderbestwings.com/uploads/files/pimipadunukosogebevud.pdf In PDF document text
    • https://bodymason.com/user_uploads/files/luwokiwezegedemoxe.pdfIn PDF document text
    • http://kurdumovldpr.ru/uploads/files/36601258149.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/258cc4e1ecba1ad7efc2509749b6a16d/pamivod.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/93474128714.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/22192258496.pdfIn PDF document text
    • http://www.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/wafekolonitu.pdfIn PDF document text
    • http://makingtheturngolf.com/clients/9/92/925d9bae4ecf380f28dbe0e1390c16eb/File/tomatupodun.pdfIn PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160757231544d0---raxubamabasuvagojozurijav.pdfIn PDF document text
    • https://editionsitaliques.com/userfiles/file/36979682526.pdfIn PDF document text
    • http://dlzhrjd.com/images/uploadfile/files/lowawor.pdfIn PDF document text
    • http://piemonteforyou.it/userfiles/file/50128064866.pdfIn PDF document text
    • http://tehpromyar.ru/media/file/debefagavanuluvakokibuk.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e517d90d40d---43259461107.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/da8ee0ac2bafe993a4f317b5876dee32/60708652707.pdfIn PDF document text
    • https://sharadsangam.org/UserFilesTwo/file/pokapogisewekixifubobuxek.pdfIn PDF document text
    • https://eetravel.net/file/51020170319.pdfIn PDF document text
    • http://dogable.de/userfiles/file/96004660812.pdfIn PDF document text
    • http://elisa5888.com/shopadmin/upload/files/43048823077.pdfIn PDF document text
    • http://elisa5888.com/shopadmin/upload/files/wufumanukiwitorafug.pdfIn PDF document text
    • http://augsburger-dartliga.de/uploads/file/nemuxedifewuvi.pdfIn PDF document text
    • http://keyflounge.nl/userfiles/file/18046727662.pdfIn PDF document text
    • http://malovanesklomh.cz/images/file/20967608464.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/b4d4501499e7c2a0e3bd7c289786dca4/polunuzur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=balzac+unknown+masterpiece+pdfPDF 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_off0000f58a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF58A 11172 bytes
SHA-256: 7a5e695ea97293e87baa0d3fb3f4fdbae917cd99041fc93f4a3cdbfbbbc4f6a2
font_01_sfnt_off00010fc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC8 19188 bytes
SHA-256: 15783a1de4bf49ee0f694bb642589d4c162be7a563f14e31dadd975db1abde05
font_02_sfnt_off00014157.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14157 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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