Malicious PDF — malware analysis report

Static analysis result for SHA-256 6afab30d7492ef5b…

MALICIOUS

PDF

80.7 KB Created: 2021-09-04 00:07:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e540de7e35826e7b7b29af1886f9d6d5 SHA-1: d11cb6054c60e8f1e14f03ec58ba87fdecbf88db SHA-256: 6afab30d7492ef5b50a00b3d0ab881b85d0eb97c8a77959b74e5c5ec5f81155d
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm hosted on compromised CMS uploads, suggesting an attempt to lure users to malicious or phishing content. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/4ae66829e96c6b0aaa5d64025650badc/93637822132.pdf In PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee8f468ce25---57910066540.pdfIn PDF document text
    • http://zit-tech.com/userfiles/files/zajaxide.pdfIn PDF document text
    • http://pokebarslo.com/uploads/files/27775022817.pdfIn PDF document text
    • http://nazycakes.com/userfiles/file/vazodukijugigukokavoxajad.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/5389139309.pdfIn PDF document text
    • http://exdebt.bg/userfiles/file/11949204.pdfIn PDF document text
    • https://bahia-group.com/ckfinder/userfiles/files/kadupiwijegubotufodo.pdfIn PDF document text
    • https://gaziemirkentkonseyi.com/upload/files/zinipizesigez.pdfIn PDF document text
    • http://schokobrunnen.com/idata/lubugudilowakitixikas.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/tamidupesirotiguxufuki.pdfIn PDF document text
    • http://kmkonsult.cz/userfiles/file/39296436007.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/c8e69c00a3b631842573b7aec86e4751/71094018042.pdfIn PDF document text
    • http://tate79.com/clients/868750/File/75870950178.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160d2c38ec903e---55934154539.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160efd9ebdf825---28173261613.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/11092750655.pdfIn PDF document text
    • http://dentherapia.hu/files/file/85156421601.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086c65b7c6b4---zufugalutasovagukoxijoxu.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/d3936d5da428e8c22f8bd4e2551c8b88/semowosilakux.pdfIn PDF document text
    • http://www.dr.schure.net/ckfinder/userfiles/files/99986939448.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=semantics+examples+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_off0000d1d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1D7 19540 bytes
SHA-256: 3750613ca2a59e33137967bfa794c40590ada74bf4f68950ffa0d95099b10b94
font_01_sfnt_off000104be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011cd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CD5 10740 bytes
SHA-256: 7ba1361df22fc95d5126187146ca77648e838ebf4e063da7dedf23c2718db478