Malicious PDF — malware analysis report

Static analysis result for SHA-256 3eab7c6ba83a20e7…

MALICIOUS

PDF

91.9 KB Created: 2021-08-12 11:07:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0cf1d991d1f753bb52b07286c213c518 SHA-1: 1eea97d632985397bb2374121259c5c13be5ce9d SHA-256: 3eab7c6ba83a20e7f4cf0cb89b101ae0d6797f3b114ac024c8a5716182005dfd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to various domains, some of which are hosted on compromised WordPress sites. The presence of external URIs and link farm heuristics suggests an attempt to redirect users to potentially malicious content or for SEO manipulation. No scripts were extracted, but the PDF structure and URL patterns are indicative of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://machnhaduong.com/images/uploads/files/48932398871.pdf In PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/16075a9c14a4ee---gujetuvomegareku.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4e08390f3e---dupozilatomawutesu.pdfIn PDF document text
    • http://federalwayhighschoolclassof1970.com/clients/8/8c/8ce2019516a67423f07d8eefa67dd611/File/popizibifagufuma.pdfIn PDF document text
    • http://asztalosweb.hu/userfiles/file/66128990479.pdfIn PDF document text
    • http://demkapi.com/resimler/files/vuduposaxujifoj.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be4f1a0464e---fuxiwanepitaveleka.pdfIn PDF document text
    • http://reanda.com/jingkelun/userfiles/files/20210724104145.pdfIn PDF document text
    • https://sts-cct.com/app/webroot/userfiles/files/51956345925.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/58360807379.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/99823fbc3950d15e297b09e39370acb6/tegavasaz.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/e64a1bfeabf2e095716a760cd32a0070/37941077949.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e3b52f9cc22---24820381986.pdfIn PDF document text
    • http://finpacecuador.com/userfiles/file/lajulanutujojalafopop.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/a27ad55a9ce7f2d632a235e54e006118/1159872904.pdfIn PDF document text
    • https://soechi.net/userfiles/file/14190960259.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a92696b499---3886452206.pdfIn PDF document text
    • https://metricgroup.it/uploads/file/60589192937.pdfIn PDF document text
    • https://rosewoodcity.org/nbloom/fckuploads/file/61378487655.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/wotixobobor.pdfIn PDF document text
    • http://appletechsolutions.com/userfiles/file/xasad.pdfIn PDF document text
    • http://pagyesa.org/userfiles/file/20210629194751.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160875845c8eb4---seduzu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=baby+jogger+city+mini+gt2+car+seat+manualPDF 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_off000101ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101EC 17224 bytes
SHA-256: ecca772f03e768171e80c9947ebfdea198bb6ded88973862da46a1771d6a6cb6
font_01_sfnt_off00012e4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E4C 11232 bytes
SHA-256: 6e7904b2d7c1cd01305d9b781e1631797a36d62d934c26320c5a4ad9cdc840ec
font_02_sfnt_off000148b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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