Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dacd50199d79eaa…

MALICIOUS

PDF

84.2 KB Created: 2021-09-06 11:46:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a7748acc0e22d478b32f82002c1dd7de SHA-1: dc6495966e0fa229888953d79ea74e5bef4c3f33 SHA-256: 4dacd50199d79eaa1d53df4b8e7980ec4612c696daa217ef5a60a85a0f56e022
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded URLs and link farm heuristics confirm the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://mikol-styl.cz/userfiles/file/dixujilatalogi.pdf In PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/qlh96hp6p5q2o0bi1j1q9u2m18/veludiwirumefoluzijetovoz.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/voxazewodukomub.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608d5c4d8ad81---koxerorub.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/4e2668b2db1951ff276de363f6b06a50/45872444311.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/dl8uqe9uldao7c2ekpadcparpr/zekuvogusipuxajavukiguvuz.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc48a465fe---20456229098.pdfIn PDF document text
    • http://remobudostol.pl/pliki/dofan.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608bc8a45b0f9---mafajasamonuxapofonibo.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/68243641507.pdfIn PDF document text
    • https://ienter.bg/files/60564035178.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021052301081373.pdfIn PDF document text
    • http://alda.pl/ckfinder/userfiles/files/31358256421.pdfIn PDF document text
    • http://ghioroiu.ro/sites/default/files/file/fizinus.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609082daed12d---farozunesuwiruvix.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/wunufebas.pdfIn PDF document text
    • http://haozuowenwang.com/imagefiles/file/bovexeporopavokuzowobix.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/6adb3e57436d999df5d1a65b6fbfcbea/nukewetekikuvanefadin.pdfIn PDF document text
    • https://learn-atdi.com/uploads/files/44035575724.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160811c5f6264f---69603103.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/176k0vn6dii74r74d8hj3du43k/duvotu.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021072216441026.pdfIn PDF document text
    • http://pmmagic.vn/userfiles/file/tidinamiweni.pdfIn PDF document text
    • http://castel.lu/userfiles/files/mifiranimope.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/mezodiwonovok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=comparativos+y+superlativos+en+ingles+ejercicios+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_off0000dba4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA4 20724 bytes
SHA-256: 97857d18d3c6c56f4380b6fa9281a72a6ea9df4e60dc171c54a1b716f111ef44
font_01_sfnt_off0001102f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1102F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012846.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12846 11404 bytes
SHA-256: a38e7684c65dddd24f7f202351dedb6e83102c2d6f038b160f86424e0a202d27