Malicious PDF — malware analysis report

Static analysis result for SHA-256 56b14bebfccb0b14…

MALICIOUS

PDF

78.6 KB Created: 2021-08-12 06:47:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: a58212893751db23bfde1e8d4ddeffb7 SHA-1: 7a5ce66e02233c328d2a2b1abe1ce0037efb8bd9 SHA-256: 56b14bebfccb0b14969ebaff1eaaac8356785cd935a28c3a1d887029f2a9a81e
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting. These links likely serve to redirect users to phishing or malware distribution sites, aligning with the 'Spearphishing Attachment' and 'Malicious Link' attack patterns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d7f12f08d---repipinukotutuzop.pdf In PDF document text
    • http://katour.ru/admin/ckfinder/userfiles/files/satoju.pdfIn PDF document text
    • https://drosamahetta.com/userfiles/file/99673855454.pdfIn PDF document text
    • https://aquatim.ro/uploads/files/kanalilutipunezixuti.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-4-29/20210429080213187907.pdfIn PDF document text
    • https://actor-conseil.com/files/file/9341491890.pdfIn PDF document text
    • https://serini-cloud.pl/uploads/editor/file/vujuvesu.pdfIn PDF document text
    • http://thekitchendesignstudio.org/uploads/files/91224426917.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca5acf245b---48251408483.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b33998a98b6---14875189731.pdfIn PDF document text
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/kj2sc9ms3khv4rr8c2lhdgh7cl/wupizujomoteruwefojazidij.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16094bdb1dddc8---nurowureresuvopenumalak.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/tneuga55i1brj8ips7e9pakpbd/gasoluxoni.pdfIn PDF document text
    • http://www.kotolantopeni.cz/files/tubituzumozo.pdfIn PDF document text
    • https://xn----7sbbg1ddpkdc.xn--j1amh/uploads/files/56640463918.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/2572e3fa151279d5f027d63f92fbcc81/25358812759.pdfIn PDF document text
    • https://gizaviation.com/uploads/files/16556236097.pdfIn PDF document text
    • https://edusfera.pl/upload/file/kunofomokaniki.pdfIn PDF document text
    • https://asi-filter.pl/files/file/torikinimuw.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160be152551121---kekezedu.pdfIn PDF document text
    • http://studioboscono.it/userfiles/files/40774817830.pdfIn PDF document text
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/160700caaaf431---52291301624.pdfIn PDF document text
    • http://penzionnakrizankach.cz/ckfinder/userfiles/files/33271863003.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=el+caballero+dela+armadura+oxidada+capitulo+3+preguntas+y+respuestasPDF 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_off0000cb2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB2D 17324 bytes
SHA-256: 9a75bd7b05c1e8710b9fef8d96082b93414eebe215c968fd43171bf84845e2b0
font_01_sfnt_off0000f674.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF674 11468 bytes
SHA-256: aeec9ea4805a0d73c747036729632a915461b60622982ae16a56fce847ebaba8
font_02_sfnt_off00011131.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11131 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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