Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6f63a270bc20390…

MALICIOUS

PDF

74.6 KB Created: 2021-09-03 23:24:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 29af703ed86b119ac978e36ea86432df SHA-1: 841601ca9e0b8eca8dd49097b4ad960fff4c2529 SHA-256: f6f63a270bc203901ad2c6a6de2fa04b32cf02ca5c18b08c67cdbf7a42dc5d7d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous external URIs and link farm patterns pointing to compromised or disposable hosting, suggesting it's used to redirect users to potentially harmful content. The presence of multiple distinct hosts and the use of UTM parameters in some URLs further support the link farm and SEO manipulation hypothesis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://nomylo.ru/uplcv?utm_term=macmillan+english+grammar+in+context+essential+with+key+pdf PDF link annotation
    • http://sevinctekstil.com/resimler/files/33484520664.pdfIn PDF document text
    • http://fteq.ru/files/file/butazabewexanu.pdfIn PDF document text
    • http://lapawan15.com/shop/fck_file/file/nopunadasidexer.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/rilubalufonab.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/8e53999c5231ef901bc75bd114cb7570/mojosawudomu.pdfIn PDF document text
    • https://purefeeling8.com/data/file/64749927098.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/8daf18fc28e34e650ac07ea69f7b4127/jujepufadigadinijelase.pdfIn PDF document text
    • http://commsoft.nu/demo/ktb/wsmbilder/files/91097468078.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a86418d5d6---tijutenawirubexuvapinin.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/a630947c5abf65acb5c9517d9290dfe9/52705716391.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8807e6cc64---32306939848.pdfIn PDF document text
    • https://itacademyindia.com/ckfinder/userfiles/files/73308320044.pdfIn PDF document text
    • http://domario.ru/userfiles/file/3983011267.pdfIn PDF document text
    • http://bensonlandscape.com/editorData/file/67428833494.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e4ef99fc2---vosixutozowuwudekujaduvad.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/b80151cacd41d767110aea0bec181319/dixusomiwabogi.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073c662dd35f---32597535643.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/90kv987def427hi5fn1thb7d59/xixob.pdfIn PDF document text
    • http://maginsaatmetal.com/resimlerfiles/60150916135.pdfIn PDF document text
    • http://lambanghieuquangcaogiare.net/vietkiendo/upload/file/9877359104.pdfIn PDF document text
    • https://clarkfamilybuilders.com/home/clark/public_html/ckfinder/userfiles/files/22767098499.pdfIn PDF document text
    • http://skulpt.in/admin/uploads/file/17041510803.pdfIn PDF document text
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc11d6da59---jawoluvodiwed.pdfIn PDF document text
    • http://bulgankhangai.mn/userfiles/files/runapaveb.pdfIn PDF document text
    • http://career-id.org/ckfinder/userfiles/files/23204676072.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_off0000bd98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD98 16960 bytes
SHA-256: 1ca455e6ebf506092587ca5a9b23d994a0057ea2ab85df46a95e5f39b97249ad
font_01_sfnt_off0000e965.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE965 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001017c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1017C 11452 bytes
SHA-256: 4a129df83e7175e7c44c0d987daca348f8a63405485bbaa8cb5e90f689de6c9f

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