Malicious PDF — malware analysis report

Static analysis result for SHA-256 5602eb49a811fad6…

MALICIOUS

PDF

76.0 KB Created: 2021-08-13 11:46:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5c44f0beaa561fd235ad21463a0d26f1 SHA-1: 197e36480d38ab9c4d6ef21b1dc782c76aa790a8 SHA-256: 5602eb49a811fad696cd64f3c14fb0287b90eff8384e230ccc0caa048dd87563
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites and other potentially malicious URLs. The presence of embedded URLs and the nature of the link farm suggest an attempt to distribute phishing content or further malware payloads.

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://coretry.ru/uplcv?utm_term=descargar+audiolibro+los+secretos+de+la+mente+millonaria PDF link annotation
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/75f5nu5g4hvt0t43dkd20hg1q2/rusajopiwurivavatumedi.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/19313698859.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a5940bbec6c---51874044014.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/84530318342.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9c0fa7c94---tarufubikekawasidu.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/7bdd1d534bb4f6432e6966596190d5ba/xadogitofemafepu.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/325e7703b6fa1f8dcfbcb88d0a6c2173/71678783896.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/80103993180.pdfIn PDF document text
    • http://drive4smilesquebec.ca/clients/f/f5/f58105ca183540932673f5bf18e62671/File/wadogemigasi.pdfIn PDF document text
    • https://rosewoodcity.org/nbloom/fckuploads/file/wedaza.pdfIn PDF document text
    • http://tipsclubcr.com/campannas/file/24357361580.pdfIn PDF document text
    • http://marcelponjee.nl/ponjeefiles/file/52583009960.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/xalob.pdfIn PDF document text
    • https://corpusbg.com/files/fck/file/berarobenumejodavojo.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e58a83a56---83165379275.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/30484514625.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2f4e332e9c---dafobemunedogezi.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210813141058478.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f75868cfece---valifabalojafebalisujesu.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b112a5197e7---55523073646.pdfIn PDF document text
    • https://lapalettedesarts.fr/gestion/file/81678291198.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_off0000c401.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC401 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC13 17712 bytes
SHA-256: 281e4d5b862b57f980951e073709b47de9b583130cdad9bdd0f4e8933dc46d5b
font_02_sfnt_off000108e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E8 10956 bytes
SHA-256: 13568a36a5f9795dc2ec2772d014b7bc8b0b01300e5b6c72868a334fc54420e4

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