Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bc16c948ec942d7…

MALICIOUS

PDF

80.2 KB Created: 2021-09-19 17:01:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5ea1b66bcd72e7b2b954184d07c673cb SHA-1: 770c2178045e23cc4ac1219ce51488bff7e913dd SHA-256: 8bc16c948ec942d7136dec48c9952cdf11b0e0e6ee55a9c969cf8383ad629e84
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with many URLs pointing to compromised WordPress sites and disposable hosting. These links likely serve as lures to phishing pages or malware download sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/be0af84b10bcd3933d620178bd557158/boxirolaximivuvo.pdf In PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/be9ebbddf8b24d370a5388ddbe0a6579/pasatif.pdfIn PDF document text
    • https://institut-arabe.org/ckfinder/userfiles/files/jinisedipepu.pdfIn PDF document text
    • https://gitteszoneklinik.dk/ckfinder/userfiles/files/67327792613.pdfIn PDF document text
    • http://zimmerei-possert.at/15401849041.pdfIn PDF document text
    • https://rusepress.com/uploads/wysiwyg/files/zugojajorupar.pdfIn PDF document text
    • http://crisismobile.com/ckfinder/userfiles/files/45393267372.pdfIn PDF document text
    • https://path.mn/userfiles/files/20973981515.pdfIn PDF document text
    • https://taperagi.com/contents/files/93287160169.pdfIn PDF document text
    • https://gastrotest.co/ckfinder/userfiles/files/96893980434.pdfIn PDF document text
    • http://jmestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/3521002612.pdfIn PDF document text
    • http://terezszilvia.com/images/uploaded/file/93289119902.pdfIn PDF document text
    • http://modern-pro.ru/files/file/makakemobopixewafexa.pdfIn PDF document text
    • http://jmyhship.com/uploadfile/files/95221129185.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142cdc05416a---wikederozuwedew.pdfIn PDF document text
    • http://yas-center.ru/userfiles/file/43173171891.pdfIn PDF document text
    • https://cyc-catering.pe/disac/userfiles/file/33070458258.pdfIn PDF document text
    • https://flardochform.se/userfiles/file/ramazibibe.pdfIn PDF document text
    • http://poornasreehomeoclinic.com/ckfinder/userfiles/files/56419648266.pdfIn PDF document text
    • http://dichvumucin.com/upload/ckupload/files/wuragifuvela.pdfIn PDF document text
    • http://ride-on-earth.com/images/blog/file/pesufebuzorogavu.pdfIn PDF document text
    • http://sujitonweb.com/userfiles/files/15776607638.pdfIn PDF document text
    • http://ecompletecontact.com/ckfinder/userfiles/files/22976492636.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132668d50e9d---63660147461.pdfIn PDF document text
    • http://www.jasfec.com/imgs/uploads/98261934654.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614243391e266---zawaxekukazex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=wallpaper+gerak+hp+androidPDF 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_off0000d746.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD746 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF58 17060 bytes
SHA-256: 2a3724f0c1750a908cc467668fa8a91ce7e91a144592bd7c438220608cce09fd
font_02_sfnt_off00011bad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BAD 10488 bytes
SHA-256: b418cb6ba49b288026d88fdb8c4d25bc3e42a002e2e7202fd4dbca0241a3c1c1

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