Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f6b684a5f026f12…

MALICIOUS

PDF

78.0 KB Created: 2021-09-12 15:56:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a6723049325c5df43e2673c104ee05fe SHA-1: 86bd57e1b1c91865b24d6f5a7b8e18170a33cf2d SHA-256: 6f6b684a5f026f127ba4f993865670e4de6d3fdb173f62b0196eb99dbba3edc6
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/16137a8ad3bbe0---34126755122.pdf In PDF document text
    • https://cedria.es/DOCUMENTS/FotosFCKEditor/file/237177803.pdfIn PDF document text
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/1425520968.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/4ab7f075f599fd9c2d81ae16c102ad70/78062426265.pdfIn PDF document text
    • http://intimatehotelpattaya.com/image/upload/File/guvibukedowirepobixapeb.pdfIn PDF document text
    • https://orcasproje.com/userfiles/file/patajosa.pdfIn PDF document text
    • http://alicekhenrylawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dupibupegisanewi.pdfIn PDF document text
    • https://aarhuskortet.dk/images/file/99008703621.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/3aaa63e1d66cc7b61f4630f77f875c22/lokesavakor.pdfIn PDF document text
    • https://giyimkent.formenemlak.com/upload/ckfinder/files/13608815588.pdfIn PDF document text
    • http://highspiritsmusic.com/ckfinder/userfiles/files/mobefazimonujipale.pdfIn PDF document text
    • http://mobilenmr.com/files/files/xozutobizikusufojizofeg.pdfIn PDF document text
    • http://originalbau.hu/imagesfiles/20042203532.pdfIn PDF document text
    • http://vitalchurchesinstitute.com/files/file/bugupokagudaxugobazapa.pdfIn PDF document text
    • http://vrieshorst.nl/images/uploads/file/rameliwunujokogutalu.pdfIn PDF document text
    • http://tumwebthailand.com/ckfinder/userfiles/files/baveramijuxubelubinow.pdfIn PDF document text
    • http://gzky.cn/dubeite/ckfinder/userfiles/files/20210908_142035.pdfIn PDF document text
    • https://rsvforum.com/userfiles/file/80593928934.pdfIn PDF document text
    • http://erfaspot.com/resimler/files/42826606907.pdfIn PDF document text
    • http://rsport.eu/yonexshop/static/file/mudana.pdfIn PDF document text
    • http://www.fashiongale.ro/userfiles/files/83946387829.pdfIn PDF document text
    • http://zezoalza.com/ckupload/files/4089008065.pdfIn PDF document text
    • http://mprime.net/ckfinder/userfiles/files/26263991858.pdfIn PDF document text
    • https://produktybhp.pl/pliki_user/File/89930747040.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=book+of+abramelin+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB41 18104 bytes
SHA-256: 8dab3aed57f5a9f8941390f3d585f243cd1cc6703776857297f11ea3edfab3b7
font_01_sfnt_off0000fa64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA64 10680 bytes
SHA-256: 4b2b42f9cc242abe61f52ae462aa795336df4623ea839a3f66edd19fc1ee21b3
font_02_sfnt_off00011299.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11299 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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