Malicious PDF — malware analysis report

Static analysis result for SHA-256 d925e4f955121f4d…

MALICIOUS

PDF

81.1 KB Created: 2021-09-02 02:53:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 11b1899c01868784e7efebe55ccf5f74 SHA-1: 6d0b2ced19c0da44013ede25b428fc6777fe2e89 SHA-256: d925e4f955121f4d5410ad4d7f3a1dc0d54b27fd27b549e1c416915c9d55178b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/54c4a96d053c7589671b66266aaed913/32082243695.pdf In PDF document text
    • http://erimti.com/userfiles/file/7493959987.pdfIn PDF document text
    • http://teenmag.cz/userfiles/file/sumebavapidowutoxuzijek.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1606f20320e592---53821776077.pdfIn PDF document text
    • https://baust.edu.bd/app/webroot/ckfinder/userfiles/files/56643367570.pdfIn PDF document text
    • http://buffagiuseppeinfissi.com/userfiles/files/42840552253.pdfIn PDF document text
    • http://xn--h1aaebajlcgx.xn--p1ai/sadm_files/reruvafulelesepugugobuwix.pdfIn PDF document text
    • http://itkaufmann.com/images/fckimages/file/37052943983.pdfIn PDF document text
    • http://olversonfamilyreunion.org/clients/5/51/51a48c89da211807e19ed56f8a1a1822/File/22596983353.pdfIn PDF document text
    • https://mcq.bmtinhoc.vn/InteriorWeb/images/images_news/files/muxogegevo.pdfIn PDF document text
    • http://dentherapia.hu/files/file/57321463817.pdfIn PDF document text
    • https://maplesservice.com/wp-content/plugins/super-forms/uploads/php/files/1375ca4b38894c196a933658cfda0e31/wevisujeboxetegi.pdfIn PDF document text
    • https://gabinetpro.pl/kosmetyczka/krakow/files/sukiwamavozutukuseretofoz.pdfIn PDF document text
    • https://dichvumayphoto.vn/webroot/img/files/gexozajikevojew.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/dizutasanik.pdfIn PDF document text
    • http://zvezda-rostov.ru/ckfinder/userfiles/files/mukukujinixunenu.pdfIn PDF document text
    • http://zhouzhuank.com/v15/Upload/file/2021852029161073.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f038f152c14---8273025724.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/aqboqms8caamjkm2l2dvvhqnur/90831100772.pdfIn PDF document text
    • http://bhs1966maui.com/clients/64750/File/norawokufuburisa.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/1e49d64df30e51189eba76b432fd9f30/21269542270.pdfIn PDF document text
    • http://lobi.md/userfiles/file/9348543094.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/109fd3bc93fd144994be686fd50c9642/2929821765.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf997b580ad---8709966451.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=i+am+your+bunnyPDF 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_off0000d9f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f204.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF204 17732 bytes
SHA-256: 16fc194c4b8d8f4eed235710e2cae5deb84b5a3b6d7af5e894e0623451c9319d
font_02_sfnt_off00012043.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12043 10036 bytes
SHA-256: 878be511e58b6f4a0b54fbe18ea8f5065791bf489efa77f19550ba4addce81ae