Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab2e404aa84bd142…

MALICIOUS

PDF

82.0 KB Created: 2021-09-07 23:12:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 87af0fa67b7f4835838b63f4d330fc96 SHA-1: 1a2e58b3c3aac86ceae19c0cea03d8a23e501060 SHA-256: ab2e404aa84bd142cd17cc96e7276d47f3fb1b1d71e690d5609194bd10b4d01e
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The PDF structure and embedded links are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://advik.net/userfiles/file/15447018129.pdf In PDF document text
    • http://brenno-tojestto.pl/userfiles/file/34062501712.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611e31a31cd89---leronelapuvujafedub.pdfIn PDF document text
    • http://apricomm.com/userData/board/file/nobepagogewetele.pdfIn PDF document text
    • http://www.andreapondika.cz/file/72720738638.pdfIn PDF document text
    • http://yksskj.com/ckfinder/userfiles/files/dofedajuwetabekemi.pdfIn PDF document text
    • http://annassteen.com/ckfinder/userfiles/files/2011159530.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160ad3efff254e---85010274685.pdfIn PDF document text
    • https://zlato-eu.cz/upload/files/32632908115.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16089916a977cd---20910335315.pdfIn PDF document text
    • http://king-pro.com/userfiles/files/lofedugupulerulunafem.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607eedaa3797b---rasekibezejoruroxozefoke.pdfIn PDF document text
    • https://unique-u.biz/images/uploads/file/85542972444.pdfIn PDF document text
    • http://xn--80ahcjevtqq.xn--p1ai/ckfinder/userfiles/files/40050426990.pdfIn PDF document text
    • http://musthighschool.mn/ckfinder/userfiles/files/risobava.pdfIn PDF document text
    • http://xn-----6kcaheblih5ab0a6afqbzoqe.xn--p1ai/ckfinder/userfiles/files/78395815075.pdfIn PDF document text
    • https://subarini.ro/mm/file/8959821939.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/77304123070.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da8bb36f381---67447586180.pdfIn PDF document text
    • https://misionesmedellin2030.com/wp-content/plugins/super-forms/uploads/php/files/etl50ctjmcvgklth69rltfg8tk/44838771206.pdfIn PDF document text
    • http://birizgardenhotel.com/userfiles/file/kenedibonu.pdfIn PDF document text
    • http://schs1968.com/clients/861610/File/72650186544.pdfIn PDF document text
    • http://alacarte-design.de/userfiles/file/54719056190.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=transforming+graphs+of+functions+worksheetPDF 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_off0000d771.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD771 11124 bytes
SHA-256: e93bde191c3515659177ca3d12c892bc2c196ffcb899e754929fe71720c7e193
font_01_sfnt_off0000f15b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF15B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001096d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1096D 18524 bytes
SHA-256: f754da51682465c1596c2b26aec17e7533d6c6cbdbee872d12ced2af127fdf06

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