Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb1205ea337af4a2…

MALICIOUS

PDF

67.2 KB Created: 2021-07-31 23:43:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b59863ddbc8b638ed5d6d74d605b63db SHA-1: 26f0129279830578518ff254258671f09db729c7 SHA-256: eb1205ea337af4a2188d0212bece2263be2dc96ff040f08a05294bbe1dd5389c
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF exhibits characteristics of a phishing lure, including an image-only appearance and embedded links to external sites, as indicated by the 'PDF_IMAGE_LURE' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ClamAV detection and ML classifier further confirm its malicious nature. The embedded URLs suggest an attempt to redirect users to potentially compromised or malicious hosting, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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 http://didula.com/img/file/60226080786.pdf In PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/60577204940.pdfIn PDF document text
    • http://dailymaydemtien.com/userfiles/files/66554861294.pdfIn PDF document text
    • https://mk-sito.it/uploads/file/matom.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/80d42b986c9522838a92a9533b85ccd2/98515641754.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/6e71475ef7813b5b2439baf99c372322/19671385406.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f00227ebd04---rutefofoledotiwa.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2a9b03ee41---51773574886.pdfIn PDF document text
    • https://ambalatender.com/upload/files/nikekelutatira.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160b781fa17f0b---libapaw.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/78942275838.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607686f71e431---nelobu.pdfIn PDF document text
    • http://poetische-malerei.de/web/editor/files/kiseduxekagagidovaxagut.pdfIn PDF document text
    • http://mcelvain2020reunion.com/clients/b/b5/b5167212b805812c9439186484f80f5e/File/43803756695.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a39fbe5351---39294932445.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/373274cbd622046b7515d6450f7fec08/banibo.pdfIn PDF document text
    • http://aaz.sk/editor_uploads/files/17430255906.pdfIn PDF document text
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/soluzubirapedojefiwemiso.pdfIn PDF document text
    • http://expertsystemgroup.com/file_media/file_image/file/tivame.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607395622d48b---dakabaxikizad.pdfIn PDF document text
    • https://www.smartfutureexpo.com/ckfinder/userfiles/files/saxegibuj.pdfIn PDF document text
    • https://gites-les-bardots.com/userfiles/file/8664253603.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=harrison%27s+principles+of+internal+medicine+bookdepositoryPDF 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_off0000ad5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c571.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC571 11152 bytes
SHA-256: f45f361c088072b068f199af54958d915fedd09ba27e95a9d1f19c7880fe1930
font_02_sfnt_off0000df45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF45 13160 bytes
SHA-256: c4208da39fd2a2c786dfc1cded360b4a4a8a996e7200c4d8e6b16de7ea754150

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