Malicious PDF — malware analysis report

Static analysis result for SHA-256 db7f488fa9cf1dfe…

MALICIOUS

PDF

84.5 KB Created: 2021-09-01 02:48:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 42aa87d19f41147bf1f1ac73573e27a4 SHA-1: 2297caa846cc3c789f32ee885b9ffabce32d3a1f SHA-256: db7f488fa9cf1dfe8f5dbbcf9f0eb4e0ebb859d37573ebb4d1d8addc92855656
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites hosted on compromised CMS platforms and disposable domains. The embedded URLs suggest an attempt to distribute further malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://aftaplan.com/works/peepsparty/html/upload_files/file/zogasogir.pdf In PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/472de16dc4ec7542b215b45ec50c5899/42827987022.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/64835562787.pdfIn PDF document text
    • http://techbis.pl/files/file/vosororaroxavexakegele.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160f17da3e35c8---sedamilupotitavuzitojilow.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/283db4f01b93f568e306d087f6383b1e/3113984147.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608ec51b5f055---82086651681.pdfIn PDF document text
    • http://accronline.com/userfiles/file/75364905289.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607854d1925f8---83434282712.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/as4mgvi2etlugm9r2mvntqnhk3/15061895861.pdfIn PDF document text
    • https://dalton-english.com/userfiles/file/paketu.pdfIn PDF document text
    • http://oralrem.kz/ckfinder/userfiles/files/lunuzobof.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a228461a13c---wasuxilumiguwotanebuko.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607062dac5cf9.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/87453457160.pdfIn PDF document text
    • http://xn--h1aaebajlcgx.xn--p1ai/sadm_files/rujin.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4972adaf542d92a2c369df2ae796d59c/wanada.pdfIn PDF document text
    • http://omeofest.eu/userfiles/files/77216440483.pdfIn PDF document text
    • http://sns.hu/_user/file/95353800080.pdfIn PDF document text
    • http://arisutour.com/ckupload/files/pabidumuxazuko.pdfIn PDF document text
    • http://coumert.com/images/file/rulawiwepovek.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/vojerinavogotutavawu.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16089d5c422b5d---83205520391.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=my+song+billy+paulPDF 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_off0000e1ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA16 10444 bytes
SHA-256: 8f6b8e57d79d0dff1fcd0e88c6bcb4c054b2c61aff77a18321b7030657905787
font_02_sfnt_off000111a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111A4 19396 bytes
SHA-256: 9ba686432ede8efc28b4722f6ee5b8377aa05aa2376a91552f59c95c244674e3

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