Malicious PDF — malware analysis report

Static analysis result for SHA-256 211b2f19dc0eac4f…

MALICIOUS

PDF

78.1 KB Created: 2021-10-17 11:08:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 41503eb161d28f4294c75f679f2caac1 SHA-1: 537f43381d728efd55b38c8a1addfc43761158f7 SHA-256: 211b2f19dc0eac4f820cfe5373509b10b752d306d501b268d34b636adeceb4c1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of a link farm on disposable hosting further supports this, as it's a common tactic for distributing malicious content or redirecting users to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://queure.ru/uplcv?utm_term=two+reeds+hieroglyph PDF link annotation
    • https://bestcaps99.com/ckfinder/userfiles/files/deruvajiw.pdfIn PDF document text
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/10102308199.pdfIn PDF document text
    • http://flashdisplay.net/UploadFiles/FCKeditor/20211002224755.pdfIn PDF document text
    • http://ekopaczka.pl/imgbrama/files/51302470950.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/7a813ccdbfc4fa17e9c0c2b8d7bee7f5/53751293850.pdfIn PDF document text
    • http://pactolous.hu/upload/file/52807974084.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612ebb16b5d25---kekelikajoleluvutubafita.pdfIn PDF document text
    • http://jenistudio.com/upload/FCK/file/didumisus.pdfIn PDF document text
    • http://www.ks-klinika.ru/ckfinder/userfiles/files/9119919234.pdfIn PDF document text
    • http://changwontour.kr/FileData/ckfinder/files/20210909_42EF589357137A5C.pdfIn PDF document text
    • http://spbmedax.ru/sites/default/files/uploads/85456639023.pdfIn PDF document text
    • https://sakesushimn.com/userfiles/files/78901936646.pdfIn PDF document text
    • http://parkingparts.com/Upfiles/file/41687590035.pdfIn PDF document text
    • http://wtmongolia.com/materials/file/96379827749.pdfIn PDF document text
    • http://boki.hu/editor_up/76158851758.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021092404495581214.pdfIn PDF document text
    • https://e-ssuances.com/ckfinder/userfiles/files/milinosuwa.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/70433848113.pdfIn PDF document text
    • https://egokituz.org/files/galeria/files/mukuzopagawepuwuvu.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161597e5a90f60---74016372574.pdfIn PDF document text
    • http://bapassamarinda.id/assets/ckfinder/core/connector/php/uploads/files/luwerigoke.pdfIn PDF document text
    • http://infinity-c-t.com/userfiles/file/23157316375.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16153747ac534e---3385690331.pdfIn PDF document text
    • https://apartmani-mestrovic-krk.hr/files/gagijekigujiju.pdfIn PDF document text
    • 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_off0000c9b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9B2 19108 bytes
SHA-256: 9256faf125c082ae2f09eb084e94240a4265d8b4b4af8d9b893423fd877f1cc4
font_01_sfnt_off0000face.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFACE 10468 bytes
SHA-256: 6005a87c57be419861fc01c4a592226aa74d5b8934e8245783ebc2ae172ee1e0
font_02_sfnt_off0001128c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1128C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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