Malicious PDF — malware analysis report

Static analysis result for SHA-256 022fcd14bb12b329…

MALICIOUS

PDF

87.9 KB Created: 2021-07-22 16:53:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 17512f264fcc9211f8a81b4cc803b145 SHA-1: 69233d6e87dc097787cb408a23b494c26ae1a1c0 SHA-256: 022fcd14bb12b3296fd099540cd408f478e4bc090302eb576242e1b3c9cace1b
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The document's structure as a link farm suggests it's designed to lure users to potentially malicious external sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://cornwallstaffagency.com/userfiles/file/25429441090.pdf In PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/hfrbesr3mfa0j40avqktjou0t5/kiwufitomesirejijidomole.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c89c9a96bef---koganujiwutafunem.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/i47tab7ld7ujvhf3codlo2brcr/63103625168.pdfIn PDF document text
    • https://deltagroup.bg/uploads/file/65500480531.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b037224d687---panimevila.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/tuwofor.pdfIn PDF document text
    • https://cochleartudaskozpont.hu/files/14501226974.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/lb62pgrou5b45v9qaits6tkijq/47114696137.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/63c2c65649ba7e7fa001d6efd225be92/nelaxubaxijuvebagogerezeb.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/837000f3d7d3a916520ca97281cad576/nogozusudapawedaw.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/2honkc93uaqfe6tp4pdctavr4h/sirodesokunemal.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/61474144973.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/7186cf9c691298a2020194df76ba07e2/60402296537.pdfIn PDF document text
    • https://praward.tw/wp-content/plugins/super-forms/uploads/php/files/5123010167ffa67765612e7c2f2a6ff0/32028085434.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/abb0a0012df2e4750cd0246b3e5aedfb/tafasesumuzepozulojut.pdfIn PDF document text
    • http://punaide.com/userfiles/files/90007485317.pdfIn PDF document text
    • http://bukharageorgia.com/sites/default/files/file/51210676380.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/69fc86fd7fcc005d85467c9f839fc8d5/64186776568.pdfIn PDF document text
    • http://www.manorbymajor.com/userfiles/files/jowitix.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071a130bce30---20262744477.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/42521236149.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608678ebe1c1c---17342141889.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+sleep+fast+at+nightPDF 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_off0000f2e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E1 17208 bytes
SHA-256: 418c79e7f23545ba8f54917ef877e09a2b59bb73b25dadb70c49ca8a4b420f05
font_01_sfnt_off00011f43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F43 10616 bytes
SHA-256: 62d942932ecdf20b26f755dc0cbb7b93e4dcfaf2ebab0012adde6cdedfa3fbe0
font_02_sfnt_off00013780.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13780 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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