Malicious PDF — malware analysis report

Static analysis result for SHA-256 38dd079f474b0053…

MALICIOUS

PDF

96.4 KB Created: 2021-07-28 10:32:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f12ee5fab432f5e2b1f95abe7bfaf351 SHA-1: 64a65e5e3832f7c1b7f0309a699f62ab717246b0 SHA-256: 38dd079f474b0053c9d7713d87946ab42dc36d5817b88ff81ca3f70074875a71
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised WordPress sites and disposable hosting. The document body is heavily obfuscated, preventing analysis of its specific content, but the presence of numerous external links suggests a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160940c49111ad---72543520584.pdf In PDF document text
    • http://pressvaluation.net/userfiles/file/gofanaburidobupa.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/fuwepawivajevasemak.pdfIn PDF document text
    • http://massimomoroni.it/userfiles/files/23821664722.pdfIn PDF document text
    • http://gadkowski.pl/repository/filemanager/file/xalawepaw.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/3m3r1a7ra52egl8plua03jgjr6/povudokolaw.pdfIn PDF document text
    • http://dribblebar.pl/userfiles/file/55981273356.pdfIn PDF document text
    • http://shopcode.ru/uploads/file/84999676037.pdfIn PDF document text
    • http://zhongguohuachun.com/d/files/teruzekotojadagijaku.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/12139656642.pdfIn PDF document text
    • https://askisan.com/upload/ckfinder/files/bupitamupukafulelawodew.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/petovufibiparapukut.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609b8a40374b7---40141501328.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/96tmmo4eagfeuk483rg417smrn/59629508579.pdfIn PDF document text
    • http://ceroki.com/image/files/peludetitiwezisunon.pdfIn PDF document text
    • http://ipublicity.cz/data/file/72879899471.pdfIn PDF document text
    • http://brandiassociati.it/userfiles/file/lajetami.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/m66kojc8f7j3o776j3m8fd85p1/10001698814.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/b760a068a21e6b6f283f9c8b881e73e7/zitij.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160944aa7c05d7---gexifuwuvovalojofis.pdfIn PDF document text
    • https://dacola.com/upload/files/61076930059.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/080ee35ac8333bff30eaf77203f0d26a/lumokosizo.pdfIn PDF document text
    • http://bmcsteel.com/uploads/baiviet/files/durajojoxe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=gregor+mendel+the+father+of+genetics+worksheetPDF 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_off000111bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111BC 11140 bytes
SHA-256: 46bc6961cb2e24cdf589850a69b8f546e8e9ce293132c1e073d4c150136de199
font_01_sfnt_off00012b68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B68 17428 bytes
SHA-256: df62f49a76df156064b394cd2ef4ec3f67ba04f3eac57017af8ff7866a50bd71
font_02_sfnt_off000158df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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