Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd3001a0d81af6b5…

MALICIOUS

PDF

81.5 KB Created: 2021-09-03 14:37:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: dcc4842c54eab90c5c0b239e48f0ac68 SHA-1: bb546d4d5ce869d4bbb23680a09bbfdf2693cec2 SHA-256: dd3001a0d81af6b5dae4a067939a5decd576faa318e5ade0e1acbcc89e0576f1
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 or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://kme.pl/global/app/webroot/uploads/file/16229199607487.pdf In PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/a50b4316c6add5e47cddd00f25e92bad/98798126242.pdfIn PDF document text
    • https://avonsteel.com/UserFiles/file/wabowenofikum.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/duloripopozem.pdfIn PDF document text
    • http://szhlfz.net/upload/jimofoweduva.pdfIn PDF document text
    • http://yachtandgulet.com/userfiles/file/14746892369.pdfIn PDF document text
    • http://cdmatik.com/uploads/file/86316755704.pdfIn PDF document text
    • https://deltaguvenlik.net/userfiles/file/77763175714.pdfIn PDF document text
    • http://datavincity.com/uploads/ckfinder/files/54372258701.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bed95ccb28a---jufasorinamepavalosonema.pdfIn PDF document text
    • http://www.abcklima.hu//data/editorfile/soraviles.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/a61836fbbc8032446782fedd2435e7c6/mazifobagofanoro.pdfIn PDF document text
    • http://icsbc.ru/fuploader//file/91140716469.pdfIn PDF document text
    • https://murtenhof.ch/userfiles/files/gilimagasevozus.pdfIn PDF document text
    • http://webcertain.ca/contentupload/fckeditorUploads/organization_/file/tolotetinoxisasamezinerek.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/30839899325.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/7hg25ll829clqk22fk790rmkk7/83326394477.pdfIn PDF document text
    • http://hasyo.net/files/file/katuravidasojefemokuma.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/580d0469d401d3c22e5d059379149b05/lujip.pdfIn PDF document text
    • https://festival-bg.com/media/ckuploads/files/sexikafanuwurekusen.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/1ad933fc90a08db4b35e44c201f1b645/37813413638.pdfIn PDF document text
    • https://debcopharma.com/userfiles/file/vajivonobakerala.pdfIn PDF document text
    • https://nistd.in/userfiles/file/zaluxusuju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=competitive+exam+preparation+material+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_off0000d9b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B6 17664 bytes
SHA-256: 578ecbe6284447652ea89388915cb6d5a00768b1f765ba0a231106b084765c88
font_01_sfnt_off000107bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011fd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FD6 10688 bytes
SHA-256: 4ff1f256f32896dfb348918df35ec9d156038181e0eff15f81c0b80fd87ead3e