Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ad4ecca8a15f2a3…

MALICIOUS

PDF

74.7 KB Created: 2021-08-12 16:25:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 8d230150bc4409ab5696c4f3f4700dd9 SHA-1: a95c6f82ce9db97cf7b0d81c6b8fff1883812888 SHA-256: 8ad4ecca8a15f2a3857163e2b7be56df3d4f8f13ae5caf857ca7230b0e5147f0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains numerous external URIs and link farms pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the nature of the heuristics indicate that the PDF is intended to redirect users to malicious external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://ketchas.ru/uplcv?utm_term=ejercicios+de+qu%C3%ADmica+org%C3%A1nica+basica+resueltos PDF link annotation
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160a64ddb0de9e---66730034045.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/7e0309277cfe4f4af38ee75468d37d90/nirorokivasasafeluniwalar.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/e28v2jnlj5t2ieh2ojn5dbhsgn/89482519144.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607a519cd2e23---zijiduxeruzime.pdfIn PDF document text
    • http://onlinecommerce.bg/uploads/pages/files/folokuludebekowalov.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606feab2bd9f8---menebum.pdfIn PDF document text
    • https://leise.ru/admin/ckfinder/userfiles/files/vibokewofuxele.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/uvk5sd5jhfle60q8m0i0derarg/mujezafiwoxob.pdfIn PDF document text
    • http://sunriverps.com/data/editor/file/lazuvedexafisud.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/6162b73fe765e6223f25c24f7cbbfecb/72700296564.pdfIn PDF document text
    • https://blueparadise.pl/userfiles/file/jabojedatefegotilawab.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee021085f8a---rumosumasufakowu.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/893d6f3a159dc83d596058fb68ebb518/78056088435.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/33076010752.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160b1481fce0c3---28044069021.pdfIn PDF document text
    • http://mojahotels.com/ckfinder/userfiles/files/83103861330.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/25628802544.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088f6a3ec019---87686435213.pdfIn PDF document text
    • http://e-hane.com/files/xexoditu.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/gisimilo.pdfIn PDF document text
    • http://drironcat.com/images/file/lilapafagakitofu.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/e5b73ff6c9f0c852c035171eda62441c/77906519438.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210610010217_1928281901.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c86aa109e11---91551802120.pdfIn PDF document text
    • 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_off0000bfdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFDD 16028 bytes
SHA-256: 897b1279bd3063827bca2ff77fcfb1ad5f6cc28d643e42c44914d59494e77f6e
font_01_sfnt_off0000e7e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fff7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF7 11456 bytes
SHA-256: a255edb523066d66a31a0898039ec680c536882d67ae381daf95fee1e810eb37

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