Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1921d9602c78055…

MALICIOUS

PDF

94.1 KB Created: 2021-09-06 08:13:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6c8308d3c2a77015f6908069fd100549 SHA-1: afa930949929e0a3a4761b7a14533547c329da54 SHA-256: d1921d9602c78055f823745afb8fd6a4f4934270c850ef252a0ab1d2e3fc2acf
156 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains a link farm with numerous external URLs, several of which point to compromised or disposable hosting, suggesting a phishing or malware distribution scheme. The document body is unreadable, but the heuristic firings confirm the presence of external links and a link farm structure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://wittnebel.dk/file/33100174853.pdf In PDF document text
    • http://cherishedmomentphotos.com/clients/8/84/84fe84b553acfcd191e166b7401b6f02/File/73093120822.pdfIn PDF document text
    • https://swift-tw.com/lcc/upload/files/8650367006.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/losizivepojetubepu.pdfIn PDF document text
    • http://myesen.life/userfiles/file/60219493246.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/21573725820.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160cbfc23b940a---xagibosuvuvuxujo.pdfIn PDF document text
    • http://bjsprt.com/uploadfile/file///2021050914563585.pdfIn PDF document text
    • https://pecsikult.hu/files/file/47149721693.pdfIn PDF document text
    • http://sparkpro.lv/content/file/wumivozuxiwutalijaluje.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160b92f748303e---tojujim.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160983ff0553bc---fipaz.pdfIn PDF document text
    • https://robert-zauer.cz/userfiles/file/lixanovawepepatevilefavoz.pdfIn PDF document text
    • http://chothuexehochiminh.com/userfiles/file/denewara.pdfIn PDF document text
    • http://eot.mn/uploads/userfiles/files/15970812236.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b046790ce20---zevugurun.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/47bdb755876f6e121583653f4dfffd59/xavanigaguripubesego.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce70407202---62652803601.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/rafafutaxemira.pdfIn PDF document text
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/5ff2e0ad7cff36df206a3217b2fcdbe7/fugitupaxemigadeki.pdfIn PDF document text
    • https://giraffeng.net/infodaily/gen-ckfinder/userfiles/files/6557120914.pdfIn PDF document text
    • http://bindashnews.com/userfiles/file/peroruferojomuxu.pdfIn PDF document text
    • http://yule-sign.com/upload/editor/file/20210810205352.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/qr6hqu569ecpnuk0sbggndln94/rologomotonexijorajipa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=periodic+table+scavenger+hunt+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_off0001080b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1080B 18920 bytes
SHA-256: 487e1356231a6a7affcd89e21a397f7982cff75cf5e039c9f735475b6fa0f782
font_01_sfnt_off000138e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000150fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150FB 11204 bytes
SHA-256: 1063852673f89c851bae229255411b67b4ebbe2d9b94034851a30058226ed3f4

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