Malicious PDF — malware analysis report

Static analysis result for SHA-256 462c1f96ae058832…

MALICIOUS

PDF

89.2 KB Created: 2021-09-04 10:53:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d0e6b29e5911be2d2c907cbff17b2631 SHA-1: 5de5f2a739d211d54a048a6b3276e142a4176d2a SHA-256: 462c1f96ae0588320762bf36cff04ba0fb8d03e0e4c0ae8f592b912869056543
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 sites or disposable hosting, indicating a link farm designed to obscure malicious destinations. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://learningkey.org/userfiles/tibovipebanefa.pdf In PDF document text
    • http://smsalumni1971.com/apadmin/uploads/userfiles/files/64915147587.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/abb366d3475a010388315e281a56d1f8/katagunor.pdfIn PDF document text
    • http://studiosiciliani.eu/userfiles/files/ruzimisepuwekibipoxonu.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd1994d678---suzagovulenofozelidozudaj.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/penibumaduvuzedirim.pdfIn PDF document text
    • http://gabinetortodontyczny.eu/userfiles/file/83241746696.pdfIn PDF document text
    • https://oxfordjsr.com/userfiles/file/45519463899.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/f8d12e34dab36f4f5e65879162c1612a/sejokol.pdfIn PDF document text
    • https://e-midas.ro/files/file/bokesukiki.pdfIn PDF document text
    • http://transchem-tech.com/Uploadfiles/files/fuvumexiz.pdfIn PDF document text
    • http://boekenwinkelindex.nl/images/uploads/45263727757.pdfIn PDF document text
    • https://gaziemirkentkonseyi.com/upload/files/63879586229.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/rokubomogupotivojaladuxod.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/tavixeg.pdfIn PDF document text
    • http://mariamozharova.ru/uploads/files/27087466252.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/93243322037.pdfIn PDF document text
    • http://poultech.net/d/files/30327936991.pdfIn PDF document text
    • http://sun-eko.eu/files/file/salowo.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fa813d4543178a2cae4ba9e871d36e9d/sowuzas.pdfIn PDF document text
    • http://wf515345.tw/CKEdit/upload/files/sigekudezuzajosudavimilug.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/95687833975.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=ableton+live+9+suite+tutorial+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_off0000f6d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010eee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EEE 10944 bytes
SHA-256: 6cebc1fe3a397b8175fbfd880d40323fa1df1ec30f1b05fe540ea45df39ee3d1
font_02_sfnt_off00012844.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12844 17612 bytes
SHA-256: 1fe702a73917e8c6a3253960e0caffe3446bf2f78b6b1a9411a9544ac12cc3e4