Malicious PDF — malware analysis report

Static analysis result for SHA-256 84e39f8ae6e94cb9…

MALICIOUS

PDF

76.4 KB Created: 2021-09-03 20:29:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b2d648ad8e214010bc53b0e88eb251ce SHA-1: c9986fa5cec6fce0326af2b93edf7c17cf418cd5 SHA-256: 84e39f8ae6e94cb9f2acce20173989059fdcb80decb568f00d04e6a6270a1cf1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a phishing trojan by ClamAV and flagged by an ML classifier. It contains embedded JavaScript and a link farm pointing to multiple domains, some of which are hosted on compromised CMS uploads. The primary purpose appears to be redirecting users through a series of links, likely to a phishing page or a malware download site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://blesk-stroy.ru/userfiles/files/87716083449.pdf In PDF document text
    • http://perechen-jurnalov.ru/js/ckfinder/userfiles/files/62707010974.pdfIn PDF document text
    • http://mellorymotors.ru/admin/ckfinder/userfiles/files/2417386830.pdfIn PDF document text
    • http://ty-universe.com/image/files/20210806_131517.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6f274a62da---36844733323.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9ae2e28f3e---53548044167.pdfIn PDF document text
    • http://tonystelly.com/clients/873487/File/62519830081.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/vr5s57hbm58ma91cm2gmprnl2d/luxuzexifilelopok.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/44291501249.pdfIn PDF document text
    • http://irollee.com/userfiles/file/muronalef.pdfIn PDF document text
    • https://tigercabinetry.com/wp-content/plugins/super-forms/uploads/php/files/b71f9b2fd2c8864587e312547d10f805/42523713403.pdfIn PDF document text
    • https://nilsahost.com/calisma2/files/uploads/lemide.pdfIn PDF document text
    • http://villa-margherita.biz/userfiles/files/tatodurirojafiruji.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608921642e050---31158982011.pdfIn PDF document text
    • http://aite-materials.com/upfiles/file/76425301038.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a8146fe3f23---vumudi.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/6915882dab75064a54db9900e0b6b89f/lazobava.pdfIn PDF document text
    • https://shopinhome.com/ci/userfiles/files/wenizalosanorifakodotasu.pdfIn PDF document text
    • http://xn--szabowski-tub.pl/userfiles/file/jakoredefuza.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/t2qe2e8flis5gj9loel7p4af1t/60421570886.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=carnet+habilitation+electrique+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_off0000c522.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC522 10964 bytes
SHA-256: 14c103b4b630df27013daf8d4093ef509b6f396b57e464a1f267b24577bd6406
font_01_sfnt_off0000ddfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDFE 17752 bytes
SHA-256: 4000f308186fed7e28bccd4deba5627599cbac38fa43b0eb4d9b6f721ac21df8
font_02_sfnt_off00010b9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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