Malicious PDF — malware analysis report

Static analysis result for SHA-256 67de86b135c814a0…

MALICIOUS

PDF

70.2 KB Created: 2021-09-30 20:04:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 85c8d5064d4228a5fe70ed90a23aa17b SHA-1: d27841a76d5786f401ba8b70cd0a7dfe088644ed SHA-256: 67de86b135c814a08f261872e7362c47a37ce00b265f91670134bd4a3d2e00c8
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 phishing or trojan payload. It contains numerous links, many pointing to compromised or disposable domains, suggesting it functions as a link farm to distribute further malicious content. The presence of 'utm_term_redirector=True' in one of the heuristic firings further supports the idea that these links are designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://nhuaduongnhapkhauaz.com/upload/files/47375990474.pdf In PDF document text
    • http://tianlanlawyer.com/filespath/files/20210913130531.pdfIn PDF document text
    • https://tidurmalam.com/contents/files/39051586026.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614cecad0b300---39515746163.pdfIn PDF document text
    • http://lex.tj/img/file/95630531545.pdfIn PDF document text
    • http://abwingsde.com/uploads/files/10955082511.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae0a400946---sepilipadexa.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/gapopevajomafama.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612ffabe34676---besigefig.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/segodujav.pdfIn PDF document text
    • http://profiklub.sanswiss.cz/files/file/68327198773.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/ojjed78d46ivs90mafbd96v6o2/sevot.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137f6f02db7c---mogokatolukadamutuba.pdfIn PDF document text
    • http://weorderfood.com/uploads/files/soxodelidinuxo.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/dc58589d8171da9c529f597e489fb3d1/fegufawifon.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/f9b7317e91b33c4b59c602ecb484d0c4/54176407672.pdfIn PDF document text
    • http://joyearland.com/ckfinder/userfiles/files/kebeba.pdfIn PDF document text
    • http://compufoxmail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/6123554081.pdfIn PDF document text
    • https://vico-real-estate.com/ckfinder/userfiles/files/fitasixukof.pdfIn PDF document text
    • http://youngshiny.com/userfiles/file/1631466226.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/36883802249.pdfIn PDF document text
    • http://josepholszowka.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xudonuxanoruzuf.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/3efe6ac8c92eb5013a546479a1a81a3c/22252941916.pdfIn PDF document text
    • http://aeklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tilulotibefumibajul.pdfIn PDF document text
    • https://nyig.com/files/file/95457790299.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=print+both+sides+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_off0000b3ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3AB 10528 bytes
SHA-256: 0cda81bbb7edf4907bd9906df424eb1c62a4266112f6c575399ab86f7313c92e
font_01_sfnt_off0000cb51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e363.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE363 14912 bytes
SHA-256: 3ddc20087203aa083594e80ed289a1cd83c70c816d1cc7e436f7fff3e9d69955

Open this report in the interactive analyzer, or submit your own file for analysis.