Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e306fb850f7f49e…

MALICIOUS

PDF

156.2 KB Created: 2021-07-03 16:07:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 9d89f06f02a973ab169f1af6ca8bc1d7 SHA-1: e279a931da7393888b2fbf5619e8438654dcafad SHA-256: 9e306fb850f7f49ea41892152676d38e37d7998927eb26cfafd6d13b6e5b190f
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or malware distribution intent. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond what the heuristics reveal.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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 https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160721c7783552---84049164488.pdf In PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210503170250167.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ffbbedcd3b---37813369794.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/22506163534.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/omupcrkam8mhra0e1gpgtkkeh6/57514051595.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/d45be0eaba0de929e05f6eaea55b0e18/61137485262.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/giludazivubugatunetimal.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/uan122bb118vcf1i0egd787c9h/92000252562.pdfIn PDF document text
    • http://penzionklara.cz/userfiles/file/basekiwerido.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b050e2de4b6---raxodi.pdfIn PDF document text
    • https://footballsod.com/images/ck-uploads/files/31716206699.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/2d96a67a29d4927121db7e7352aca26a/zaruwor.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ccea248d1d---82954806664.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/5sjeh5fkcnksd5a93kh8p6rgpu/rasapekir.pdfIn PDF document text
    • http://ultraljud.nu/bild/files/30557960185.pdfIn PDF document text
    • http://www.reenactmentmarket.eu/images/wyswig_images/file/tiwalodutemafopomosop.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8de90f0cb---61660988361.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1608471ef5f6b0---29853547282.pdfIn PDF document text
    • http://historia-bfured.hu/userfiles/file/16147341227.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/lepaxu.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/wegumopetizizadazobotanop.pdfIn PDF document text
    • https://istanajp2.com/contents//files/demofadelageb.pdfIn PDF document text
    • https://bursakaynak.com/userfiles/file/xapevuleroxixi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=nude+driving+storiesPDF 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_off00020205.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20205 18596 bytes
SHA-256: 019d6fd328d750d826bafbfb8b9350f46e7a9cc37375be4d8bc39602d319b2fe
font_01_sfnt_off0002326a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2326A 10360 bytes
SHA-256: b0982bef429367b278679b5770ce5bb80fa426cfc3c97ae80a13df38c727dc10
font_02_sfnt_off000249c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x249C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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