Malicious PDF — malware analysis report

Static analysis result for SHA-256 22798ff680166554…

MALICIOUS

PDF

85.6 KB Created: 2021-08-25 19:04:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 255e377bc014fe454110fbbdfa9088cd SHA-1: 66193e536f9c30b18eee56727fd88c6a513b6235 SHA-256: 22798ff680166554df09f4f523685c30f69c325caa41c8da53c2cea7dffb1d56
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farms strongly suggests an attempt to lead the user to a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9914

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://motiwalainstitutes.org/userfiles/file/18282100058.pdf In PDF document text
    • http://slovbau.sk/test/userfiles/file/vuluvolad.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/81821097926.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/15d2a6dc5563b000a0e37d6007538d6e/56980102780.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/99361074504.pdfIn PDF document text
    • https://mytopics.it/uploads/file/3796731557.pdfIn PDF document text
    • https://dmitrovka-zn.ru/admin/ckfinder/userfiles/files/sadosubilaralagakexofip.pdfIn PDF document text
    • http://coachhouse.info/assets/file/10982928548.pdfIn PDF document text
    • http://starwindows.ie/ckfinder/userfiles/files/31181159849.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/b7a9aa1d860e7be8a9bfe0bcfebe18fe/lurexob.pdfIn PDF document text
    • http://thaihotelsale.com/FileData/ckfinder/files/20210719_45EA830BC7E4362A.pdfIn PDF document text
    • https://coopinproject.eu/ckfinder/userfiles/files/juzowokekimivana.pdfIn PDF document text
    • https://hgb.se/filer/file/556654458.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/202168847295346.pdfIn PDF document text
    • http://spearmanhsreunion.org/clients/e/e1/e1754705b4c076d7cd520c5e9e79ed07/File/86701634735.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606ea4619aea2---65040200091.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fceafa91d4---47533560013.pdfIn PDF document text
    • http://cec-intl.ru/app/webroot/files/file/pagitomibuguzukuranumu.pdfIn PDF document text
    • http://arndt-fahrschule.de/userfiles/file/vusawivuganinale.pdfIn PDF document text
    • http://bluiettgriffinwilliams.org/clients/2/2a/2accc941c041fffeac9751862bb8fe41/File/nibelotanofujim.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae797f9b6f7---97783057949.pdfIn PDF document text
    • http://jevades.com/aircraft/fckimages/file/42376055105.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/251e1d8c2e76845ee233a42d81bfaba4/zesuled.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160e7af6c7517f---11069880099.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160769ac31c109---nevufojogape.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a68c620091---8247167202.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=escape+from+innsmouth+2nd+edition+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off000110c5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x110C5 17596 bytes
SHA-256: dbdd0e262c591d6737340c1408e1ee4a5801ee5ef546e33abc81aac0368fd280
font_00_sfnt_off0000cca3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e4b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B5 17368 bytes
SHA-256: 0a44bbd5018ff6d9912727f37956e44f71c3bcb8396b42b7e9b1c2c15ab78ef5
font_03_sfnt_off00012bdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BDB 11040 bytes
SHA-256: 0603a9cbf9469aceef7e00f151d4106727ebfab9b8e704f0a5516c0e03810202

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