Malicious PDF — malware analysis report

Static analysis result for SHA-256 33bc6bd899a47848…

MALICIOUS

PDF

85.3 KB Created: 2021-09-13 11:36:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9b4e3bd3c08ab2b18df10acda3ecb8d8 SHA-1: 143550d673e889dfa1a23380c66bf9e19780d878 SHA-256: 33bc6bd899a47848de771bf4df094a313914d512d0419bb427850a9eb58a433d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of embedded JavaScript suggests it may be used to further obfuscate the redirection or download additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://nomayaku.com/userfiles/file/58718459775.pdf In PDF document text
    • http://asid.rw/userfiles/file/84239073222.pdfIn PDF document text
    • https://www.bankkartya.hu/js/ckfinder/userfiles/files/73771155859.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/vnfrc2joj3p21fk8b7n9lev195/revamotufegonozatunubal.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/buzon.pdfIn PDF document text
    • https://traiteur-troyes-mariage-buffet-aube-10.blaisot-traiteur.fr/ckfinder/userfiles/files/85928675329.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/61803725725.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eadda16983---57024001897.pdfIn PDF document text
    • http://carzip.biz/files/uploads/files/pamorowozokonitinapis.pdfIn PDF document text
    • http://labonscafe.com/userfiles/kinizak.pdfIn PDF document text
    • http://geteffective.biz/uploadfiles/file/30929978108.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/89605367874.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613c937467c9e---purajinizof.pdfIn PDF document text
    • http://mygiftltd.com/userfiles/file/zebizedunuduju.pdfIn PDF document text
    • https://currenwatch.myhost360.cn/file/upload/files/09-01-07-57-53-20.pdfIn PDF document text
    • http://polkovnik.su/upload/file/jojelowugifegavojefaril.pdfIn PDF document text
    • http://ajisushionline.com/uploads/files/sidubiripexapur.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/152890bb4fc893beb4ae1b42f1c1fb71/dufarijisowazuzaxelitiw.pdfIn PDF document text
    • http://machulski.com/public/file/61292013444.pdfIn PDF document text
    • http://dentalcenterstudio.it/userfiles/files/30960157479.pdfIn PDF document text
    • http://knipia.com/userfiles/file/janexewew.pdfIn PDF document text
    • https://kirmatas.com/userfiles/file/pedalaxamaradari.pdfIn PDF document text
    • http://mobiliteit.nu/files/gixipurimutikekudanafuz.pdfIn PDF document text
    • https://newcar-rental.com/uploads/files/202109010248544796.pdfIn PDF document text
    • http://aloeverajuice.cz/files/file/39029198276.pdfIn PDF document text
    • http://thepducphat.com/upload/files/29880417432.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=skype+for+android+free+download+apkPDF 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_off0000e893.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE893 17932 bytes
SHA-256: 8ae0d416fc11d055746c753a5b6a17f19113663d70f785c22c2a6704bbedbae2
font_01_sfnt_off000116c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116C1 10592 bytes
SHA-256: 61dada2b430ac6fb4eb76e6cc9b531010c95c11fc2a89f0520021dbb2a5ea1f4
font_02_sfnt_off00012f1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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