Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb9847ca3e39571b…

MALICIOUS

PDF

82.7 KB Created: 2021-09-06 02:00:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 860e30a9166a0b8af8d8086b89a7cdf3 SHA-1: 8497ff4f7594dd8d2b22327c534876aad1e9a112 SHA-256: cb9847ca3e39571b8d2199a34b5d15435e14fbfcc1845fc529ffa67ca1c8b7d2
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 a machine learning classifier with high confidence. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically identifies this pattern. The document body is heavily obfuscated and unreadable, suggesting it's not intended for direct user interaction but rather to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/p4humubs497ncmn9g1gsi8cn24/49459935020.pdf In PDF document text
    • https://amigo-shop.105h.net/upload/files/35488197484.pdfIn PDF document text
    • http://theemasternetworker.com/ckfinder/userfiles/files/39701531319.pdfIn PDF document text
    • http://standardamulet.com/files/files/fakusorozofivikopo.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/e1f51700034c4104c0641add9d36f4f0/vofodepewepevukujazebul.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/76664071848.pdfIn PDF document text
    • http://denkobarbell.com/_upload/files/19832938115.pdfIn PDF document text
    • http://eurekaelearning.com/upload/news/file/kazazezuradaxovem.pdfIn PDF document text
    • http://normel.org/files/upload/file/zoruxibunesulukixenof.pdfIn PDF document text
    • http://ezclasssites.com/var/wwww/dev-ezclasssites-com/data/files/kedebef.pdfIn PDF document text
    • http://amidoux-peintures.com/ckfinder/userfiles/files/93904130705.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/efbc9a71bba366d13717734150894309/26832876374.pdfIn PDF document text
    • http://security-m.jp/tool/images/file/66410884797.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070351e9ce94---figadimosute.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e4a8360587---94721740935.pdfIn PDF document text
    • http://jtylek.pl/Upload/file/53379025246.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/875e73f4478e3f71f2bc966766e40442/87370812907.pdfIn PDF document text
    • http://tuhocxuatnhapkhau.com/uploads/ckfinder/files/48307756860.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ed0092276f1---2219432754.pdfIn PDF document text
    • http://bong-dem-long.org/upload/editor/files/14418220996.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/fefe7410566c67d4dccd93a5e6215543/fogakipotudibatunavokev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=quantity+words+exercise+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_off0000d7ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f000.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF000 19752 bytes
SHA-256: 6fd684710d0625292b56bf8e073cebfa283e495914efc88add297df027a5e65d
font_02_sfnt_off00012361.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12361 11028 bytes
SHA-256: 0bdbe3e011f15709b452c4d9d3ae296ce85f7165bfe73a37e79a90b9a551611f

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