Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8cad29bc35715d2…

MALICIOUS

PDF

81.3 KB Created: 2021-09-04 21:02:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: cc588f3a9f014d0ff439e99f09261553 SHA-1: 15bc47ab17dbbc8b2ba7c702799443b3704c5826 SHA-256: b8cad29bc35715d2b72b873c10b3b3d922a1a569dfe46619a2c801146f8bec91
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress installations or disposable hosting, suggesting a phishing or spamming campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites or download further payloads.

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://sabresources.com/FCKuploads/file/wojasi.pdf In PDF document text
    • http://alfonsoguiggiarchitetto.it/userfiles/files/rotufikar.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/16075d9e928953---tigugefedu.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d777ac0cabe---ketepuvutad.pdfIn PDF document text
    • http://weighlessthisyear.com/ckfinder/userfiles/files/10991469162.pdfIn PDF document text
    • https://bocrangsuthammy.vn/upload/files/zewores.pdfIn PDF document text
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/selarimukusizagov.pdfIn PDF document text
    • http://pspectr.ru/userfiles/file/89740506842.pdfIn PDF document text
    • http://toonesk.com/upload/9799524574.pdfIn PDF document text
    • http://nscenter.cn/upload/files/47995063654.pdfIn PDF document text
    • https://dakotaterritorydevelopment.com/ckfinder/userfiles/files/tomit.pdfIn PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/72fc3bc0d564252ff6087de3faa04763/rezenudozo.pdfIn PDF document text
    • https://ikitellirezistans.com/upload/files/23225794933.pdfIn PDF document text
    • http://kaizenlife.com/ckfinder/userfiles/files/dijexawudujaradiro.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/33209599284.pdfIn PDF document text
    • https://nacionalequipamentos.com/ckeditor/uploads/files/34770474226.pdfIn PDF document text
    • http://brmxn.com/userfiles/file/20210613004411_xljjbi.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16091588b0b0ce---sufotowunamobenagosiguf.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/18502dcffac2f5cdb63b30fa3e2d80be/20449139552.pdfIn PDF document text
    • https://preciseenergygroup.com/media/84180158603.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/rowegelejumeni.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba8f8b72aa---42712344442.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160c2a5f4bc2af---3484741052.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=polar+moment+of+inertia+formulas+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_off0000d4d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ece6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE6 18884 bytes
SHA-256: aa78d65d862941b362eeeb6d72d2a2e55b2f59215a010c960256d3eac402a1b1
font_02_sfnt_off00011eb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EB3 10760 bytes
SHA-256: c7021ffefe7c3b2f27fe28adaf87f623eb37016d69cc0a15d1fcd51ed7305075

Open this report in the interactive analyzer, or submit your own file for analysis.