Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c1f9c1d8ea50db4…

MALICIOUS

PDF

86.4 KB Created: 2021-06-27 06:12:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 6677957fd52d220bf363f13ef5f2db97 SHA-1: 5ea84a344cb3a3a303d0c02f47a0df1c5a73e22d SHA-256: 5c1f9c1d8ea50db41e529c599b7146409ea0bdc9d15eca423b23afa310d1729b
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting. This pattern is commonly used to distribute phishing pages or further malware stages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://geose.ru/userfiles/file/15518069059.pdf In PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/t09ojghr0dpqh2aof8l01k948j/39257951848.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0f78dedfc---repenorafelubipivukonug.pdfIn PDF document text
    • http://ixtvs.de/_upload_bilder/_filemanager/file/zepiw.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/040451233501.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c28dfc867a9---zadodewororutijum.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/8ba84897f57e520841d9a9b21539bc63/84558633783.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/44dc11b3186d41e4e6b0d62d6e09020e/sijamowo.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/lebobajireduv.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ad95952b3d8---38285248746.pdfIn PDF document text
    • http://lobanowscy.pl/userfiles/file/97028472842.pdfIn PDF document text
    • https://bruceautoservice.com/files/file/17146827505.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/03741637998774ad05eb8c2368988b79/mutozosuduruganalovur.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/84736914603.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/4b7a0bca9f36c4aa6c4a1c0248f2d32a/jutikegavovufiri.pdfIn PDF document text
    • https://synodradomski.pl/userfiles/file/mogapisivopew.pdfIn PDF document text
    • https://pensiuneavlasin.ro/wp-content/plugins/super-forms/uploads/php/files/q7tqtc1i3ilhrdak24emjh9rdo/12750099195.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e479cd446e---potipozufanafinoxa.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cdbe295393b---88367256190.pdfIn PDF document text
    • https://bouwservicewinthagen.nl/userfiles/image/file/jelafigafon.pdfIn PDF document text
    • https://papersacksfactory.ae/images/bulk_images/files/24086089480.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/26eaf02bb7de62312736b67552d9843e/66639539506.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/zevodugejinamesij.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9b5a708fb---givoxutupu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=biggest+time+wasters+at+workPDF 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_off0000ef03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF03 17180 bytes
SHA-256: f167983b322213d2d6fc605d20d408474d70197e1e644b168bf31ddbd114918c
font_01_sfnt_off00011be6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BE6 10532 bytes
SHA-256: 2faa8e731d1d2ab617b3a87d6b5b5f7fbf32f42fccffa16148784e2b2eb62d8c
font_02_sfnt_off0001340f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1340F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1