Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8622e498536ea3d…

MALICIOUS

PDF

100.6 KB Created: 2021-07-19 08:09:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: dd552d06c2f2b550f934ad70c49cdd72 SHA-1: 451b1d6bf797c63a766a063e593b02a5ce9e48bf SHA-256: a8622e498536ea3d139313f95bf1e5140429735a92f98a19dd83878ccc764dbf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous compromised websites, many of which host PDF files. The presence of external URI heuristics and the 'PDF_SEO_DISPOSABLE_LINK_FARM' rule suggest the document's primary purpose is to manipulate search engine results or redirect users to potentially harmful content, possibly as part of a phishing or SEO spam campaign. No scripts were extracted, but the structure and URL patterns are indicative of malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

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://oumkua.com/userfiles/file/77356068981.pdf In PDF document text
    • https://coolingrealestate.com/your-home-cleaner/FCKuploads/file/18807688202.pdfIn PDF document text
    • http://jagodkaprzedszkole.pl/userfiles/file/22707143435.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607666585da73---puzewusefi.pdfIn PDF document text
    • http://finpacecuador.com/userfiles/file/xinumupafizexobemewix.pdfIn PDF document text
    • http://studiomanzella.com/userfiles/files/tariwirasedajowenemudege.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/b630aebd3a7578d992afba24483efbb5/88867824638.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/6m7qak9i2ddojrn4lvd8ik2a6d/75199393185.pdfIn PDF document text
    • http://camberwelltaxi.com/survey/userfiles/files/89988921078.pdfIn PDF document text
    • http://kiuruvedenlukio.fi/tiedostot/file/40327240642.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160893b22cef0a---kiwisikakasinuza.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/a7dd772e4a823f8898da06ebdd3dac99/35800419147.pdfIn PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/94ada08c7d5f7395eb7bc7dc6edfcc51/28727004073.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff67215d7f---65288406787.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/xijitiwizo.pdfIn PDF document text
    • http://jimigubellifoundation.org/clients/f/f9/f96c94eea877db95ad0a8b6fd709b1ed/File/91808565530.pdfIn PDF document text
    • http://bowenlawmt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nokivirulifodif.pdfIn PDF document text
    • http://marathon-gexin.com/Uploadfiles/files/34528146252.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/l1a55pkohs7s2lg1mh0vsq9q41/52224980888.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/e8ce0b8da490a389cdb0dc9b2b98aed0/rewosizef.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/9bb540129e7ed4861c94580dcec7436c/kovubinosolesesupala.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/df4e46a0f7e16d76fe00eda245b4a1ff/pefagufi.pdfIn PDF document text
    • http://wongkungfu.ca/clients/f/f5/f5c316b966f29b3192b3e9e3c5714b3c/File/54291285500.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=employee+reward+and+recognition+systemsPDF 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_off00012672.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12672 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013e89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E89 11040 bytes
SHA-256: 96680ee416e434b9f918e8f4533662a1acd498d98cda3755e397c1c058abba75
font_02_sfnt_off0001580b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1580B 17308 bytes
SHA-256: d917105295b5cc4dbc13b912289b141fe73ab6b55f87f6c6fa5211174caecbf4

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