Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa84909534956847…

MALICIOUS

PDF

99.7 KB Created: 2021-07-04 13:45:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: c3eec3bcce5602920b8e938e2bf49fc0 SHA-1: 06094b70e04980c4488f257c69cf3795db616a39 SHA-256: aa84909534956847005422a2442a3fbd0b032d7b3b0e28641bc964a39e402d40
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting sites, likely for phishing or malware distribution. The presence of external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest this is the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9681

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://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee9070307a---nasogofazatobiwanin.pdf In PDF document text
    • http://songhandiban.com/uploadfile/file/2021063003215073499.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/1878391a422e172991b21c829461046a/wepir.pdfIn PDF document text
    • https://sonntag-immobilien.lu/userfiles/files/9219582696.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607b691a54558---wutolododada.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210508021553.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608947b07cf56---50697551892.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/6v768r8mppufrmc4tcmgnsml7g/noguwewiwomukobaza.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16085da3f3973c---wukej.pdfIn PDF document text
    • http://wang023spa.com/userfiles/202106file/2021062909014770554.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607281be12836---zusirevidoxidumegigas.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/nikijerorigek.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bb42a0969e9---xawote.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/oa0u6hbo8q84v159ph10jbm9m7/sosipu.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/ca6ac96e7414a82b47ee3ecee93a6501/biloruwasuvutenalimid.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/b0f975fd94052048f3819b3502c51c79/48110764060.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/topomisifejililom.pdfIn PDF document text
    • http://parvazyab.net/basefile/api203/files/87205670181.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/15071254566.pdfIn PDF document text
    • http://campbellelectronics.com/uploads/lofopezema.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/92107923066.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/tazoze.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607e66cb11e10---39494926364.pdfIn PDF document text
    • https://turbooto.vn/upload/files/mosogurilipizoziz.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/v9gpp5vt8tr8b4dorildot4ah2/raxidamixusofarol.pdfIn PDF document text
    • https://oklasik.com/ckfinder/userfiles/files/zujesok.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16098c06319300---35529335375.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=took+a+whiffPDF 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_off000113da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012bec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BEC 20820 bytes
SHA-256: bdc6bd7b6383ea4e28bff58b294abbe2a1bed9647264e28038c7d1bdb80bcc34
font_02_sfnt_off00016210.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16210 9804 bytes
SHA-256: c6166d1ae75c9593b392df3863a0a47e4df04eafd1eb3185cf4f8126c72079c5
font_03_sfnt_off000177b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x177B3 2044 bytes
SHA-256: 9ff0be215eda4510cc1b192ab1b3482226358aa5dcf0ff2a485682e2549b9830

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