Malicious PDF — malware analysis report

Static analysis result for SHA-256 de238069f19f008a…

MALICIOUS

PDF

81.3 KB Created: 2021-10-10 23:18:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f0ff1682af11a8dd62474d8ac48c84fa SHA-1: 0716c02a7480ce74a22875e56111cf3c1707f162 SHA-256: de238069f19f008aac98e830ccc7a62f948a9684eef984208e4b7bab3b62cb8e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous links to external websites, many of which are hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of external URIs and link farms suggests an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://catamma.ru/uplcv?utm_term=atelectasis+of+both+lungs PDF link annotation
    • https://iohrp.org/f_files/files/54280106250.pdfIn PDF document text
    • http://lt101shop.com/userfiles/files/86967692678.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161408afff00af---nogadalumusavoxijubi.pdfIn PDF document text
    • https://cjsc.se/ckfinder/userfiles/files/81756837334.pdfIn PDF document text
    • http://5mal4.de/moneyvidya/web/images/userfiles/file/bosugagudofikuvoboxobevo.pdfIn PDF document text
    • https://matfplayer.com/calisma2/files/uploads/nenexufat.pdfIn PDF document text
    • http://ecohouse-lab.com/userfiles/file/pewivetokabosetajibeku.pdfIn PDF document text
    • http://gameometria.com/assets/ckfinder/core/connector/php/uploads/files/xogumerudenevaligemo.pdfIn PDF document text
    • http://e-photosynthesis.org/userfiles/file/woputanaduzemutorap.pdfIn PDF document text
    • http://hanauhrova.cz/files/80720573072.pdfIn PDF document text
    • http://tomboy2.com/images/library/File/tebufeditu.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/16155ec320e1c2---10193304967.pdfIn PDF document text
    • http://uhorder.com/upload/files/26725301942.pdfIn PDF document text
    • https://dolmalatrek.com/userfiles/file/rugapuwululuwinepomakufi.pdfIn PDF document text
    • http://vanguardhungary.hu/userfiles/file/muwobozovidibuzuxajefene.pdfIn PDF document text
    • http://artpolyclinic.com/file/files/xabaziwozajiratene.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/a6a070a04e8a36a388804e33612bd67a/85358358740.pdfIn PDF document text
    • http://tochalco.com/uploads/files/rimigejiramibanupevute.pdfIn PDF document text
    • http://wintec-samu.hu/uploads/files/xunapamufi.pdfIn PDF document text
    • http://form4concrete.ru/pics/cont/file/guxudodefanilowoponoxuse.pdfIn PDF document text
    • https://daqing-jewelry.com/uploads/files/202109062008456215.pdfIn PDF document text
    • http://gshosnab.ru/userfiles/file/8085110084.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16152d9c11428b---6000554915.pdfIn PDF document text
    • https://miminku5.com/contents/files/19542349692.pdfIn PDF document text
    • http://www.nachtruhe.info/up/files/59022390835.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_off0000d89a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD89A 18308 bytes
SHA-256: cd1236e29cdac157f5622e8f8c2d5e27e92834802c16cafaa2a25e48a4e77407
font_01_sfnt_off00010745.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10745 10736 bytes
SHA-256: ab47d914bf5c555f60b13a602fc848b2fcdd36db6d98b6fe3a5389fca4214a85
font_02_sfnt_off00011fe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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