Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba4bf301ea63a979…

MALICIOUS

PDF

113.6 KB Created: 2021-07-13 19:58:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 83df87fc95ee9e895a0558f16efaeae6 SHA-1: 5755490d4f8686030f51e64a05f018468dd2c628 SHA-256: ba4bf301ea63a979216c780ca497a71b89000f1aef392bdb154d42a5188fe5ad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm or phishing lure. The PDF structure and embedded links are indicative of a phishing campaign designed to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/a5b6f80b00b5ea8a7654d43e4102a727/loledaxisojojepavuretepof.pdf In PDF document text
    • http://come2menorca.com/images/file/nivosizubosapoledef.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c4e980d126c---donazubunaz.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/ranexulaj.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/30cb646928acadb354512f169bc7a7ac/78286927501.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/6af30498c1bc1ca999030104396176ad/25754868768.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/3b97b0414ee2ceab4c12986d8bb2e116/rexiduverenowel.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609dcbe83dffc---tizufe.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/7765818c3dbb488ad3ca79c208044d50/kofegonilekera.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608388425de76---pitedizanisixi.pdfIn PDF document text
    • https://zoldlepes.hu/userfiles/file/foniloxaxiruvisuge.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606f5e970c8ab---14505094630.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/54729720175.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/b64723623bfb14df3dd1dec716358756/90824110922.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/94092498462.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/32626782396.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/4e2e785de66d9bab5abb1bc70b0fc659/guratikekoduwubebovipexu.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c58d7c7f43c---pideguzarasowunubem.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/7a02c573ff20ecc72c974ebbce5857b2/wonelilaxubuzabanibogexo.pdfIn PDF document text
    • http://phannhan.vn/files/usersfiles/files/3231317463.pdfIn PDF document text
    • http://dzbnf.com/upload/file///zikaxuniben.pdfIn PDF document text
    • http://teraval.cz/res/file/dekabinix.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608194289cf5c---51927203001.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=stealthwatch+ordering+guidePDF 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_off0001582a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1582A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00017041.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17041 10740 bytes
SHA-256: cb6005134726925b06b15e37a45ded18cbc6a12a29c004f4fe0ce87705c4f1ef
font_02_sfnt_off000188c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x188C4 18116 bytes
SHA-256: 9b42e5329e0099e2e0e3358bba44a3087ce27f00b680974b93170be51ff62bc4

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