Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd6b4b84c19472da…

MALICIOUS

PDF

102.6 KB Created: 2021-06-29 21:22:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c82dd550676d0a5ee1fd9fe44eb05d1b SHA-1: 156b40a9ad61d0997b3e248daba50ebad0f839a7 SHA-256: bd6b4b84c19472da49ce3f7a949f04a35070104da5779c0e21ed761ec0778dd5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm with numerous URLs pointing to compromised WordPress sites, likely intended to host malicious content or redirect users to phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not meant for direct user consumption but rather as a container for these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9874

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 http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607289aad7ad7---13811038555.pdf In PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16072fb6e75774---pupaforadoruse.pdfIn PDF document text
    • http://satakantaresort.com/user_img/files/1304222077.pdfIn PDF document text
    • http://annandale1963.com/clients/69704/File/rizukemezakamusazogopos.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16075c432daed4---94270457913.pdfIn PDF document text
    • http://www.emailposte.com/pictures/41133406081.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/9108574016ed542bf073ca3f2cfcdbad/getubapesito.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/bamilefoj.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a6566ac9a---18947642083.pdfIn PDF document text
    • https://charqueadaboavista.com.br/wp-content/plugins/super-forms/uploads/php/files/efe4e8705febeb2cc7921d1305dd0362/fulusezulevitov.pdfIn PDF document text
    • http://dlt-nkp.com/fileupload//file/23161591260.pdfIn PDF document text
    • https://slaterlighting.com/wp-content/plugins/super-forms/uploads/php/files/fda53439bee042500d49227066706387/5416695310.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/66b1aae80f2ce1ece7476f442fd5bb84/najilefijogosedizopogixem.pdfIn PDF document text
    • http://liyangah.com/Upload/file/27525268855.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/f36ojgomf1ntbig0nepf7ub7ac/fomidaxaf.pdfIn PDF document text
    • https://afra24.com/basefile/afra24/files/jabukuk.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/1jta70iussvfbe232dt3n80jf1/70900905493.pdfIn PDF document text
    • http://uni-farm.pl/ckfinder/userfiles/files/vulazunizadewipujipebop.pdfIn PDF document text
    • http://shannonlakeestates.org/fck_images/file/7957624818.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609473c2eb272---32051854969.pdfIn PDF document text
    • http://thallo-food.hu/uploads/ckfinder/userfiles/files/lugaboki.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/233e7f4feefeed699bd00185b7f53e1c/97377759734.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/vebaru.pdfIn PDF document text
    • https://ka-base.no/images_content/file/waginuderawuvakobin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=toy+poodle+tail+dockingPDF 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
font_00_sfnt_off000122bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122BC 10592 bytes
SHA-256: e34636e859a0e1493e85788dafc070ca480ab5bdb99651ac8ad98d1bd40b53f1
font_01_sfnt_off00013ace.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ACE 2296 bytes
SHA-256: 01f027aa1a20ae5e1b2ae90f09b5c7ceaabd8a2f28ba34b996bc5c7d0072686d
font_02_sfnt_off00014503.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14503 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00015d15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D15 18724 bytes
SHA-256: c3714826a552a8c355b2a737e153707dff91d4b558fc85aa8fc5cbd220e9f6db

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