Malicious PDF — malware analysis report

Static analysis result for SHA-256 17728e28d7028ac8…

MALICIOUS

PDF

88.7 KB Created: 2021-08-14 06:44:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 41ccbed81372b42393dcaa496faf05d6 SHA-1: aafc4ab2a08edb726f40ee6ac2817e1b2a328eff SHA-256: 17728e28d7028ac8af9e92c7bba90ce1fe0acb7ffbfcf98bc4d696aa006d2456
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with numerous URLs hosted on compromised WordPress sites and disposable domains, likely intended to redirect users to malicious content. The presence of external URIs and link farm heuristics indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://ketchas.ru/uplcv?utm_term=how+do+i+get+tubi+on+my+vizio+smart+tv PDF link annotation
    • https://europartner2.pl/uploads/30426167672.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/049743db73ac3f2ef65abc2031d2045c/nimal.pdfIn PDF document text
    • https://jensbrode.de/files/file/93408097922.pdfIn PDF document text
    • https://amatnieks.lv/pictures/image/51110086291.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/ec4812c15492c065a12ef1c1e9ee3c3d/22408005466.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/bd3bb2229955ed4897988e0220324871/34826852047.pdfIn PDF document text
    • http://goldenpeak.it/userfiles/files/17494772130.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16085cb31c0803---razebal.pdfIn PDF document text
    • http://career-id.org/ckfinder/userfiles/files/ruxiruvonebibupipake.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160fd8b1444a12---77533082396.pdfIn PDF document text
    • http://arcstema.com/userfiles/files/bisubonagedorejiv.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/n2j0glg5b5jlov17a212q6g2uv/10106382376.pdfIn PDF document text
    • http://vasamo.org/pds/userfiles/files/36157442484.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/38797a3452c2817616495af71d9794a9/ludezawizefikufif.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/2cdr9t7n2kbj83viqpvfjf095d/13264926016.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/16074916eb4352---zavufe.pdfIn PDF document text
    • http://loadcell.vn/Images_upload/files/jotavojenafoxu.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/910235d21dea278bf6b8573bd16afdf3/69542708267.pdfIn PDF document text
    • https://kidneystonetreatment.in/userfiles/files/85733174300.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/3948b3b954c0533071cd2c8433b59270/wodad.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/g4bii8rqu8c4m1gihqocgpu4h2/zirezitaditox.pdfIn PDF document text
    • https://oliogalanis.com/file/fevujogenikabuven.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_off0000f41e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF41E 17764 bytes
SHA-256: 21e11b244a5d05ef211b27191df1e60720e4c925ec5cb5ec0de4eecfc2c870bd
font_01_sfnt_off0001228e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1228E 11104 bytes
SHA-256: 855bf95b6719405f18240a23705417243a254d0a5cd560fd2fe176cec9a3a3e7
font_02_sfnt_off00013c4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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