Malicious PDF — malware analysis report

Static analysis result for SHA-256 339a406cf9c1322a…

MALICIOUS

PDF

79.7 KB Created: 2021-09-03 19:44:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d33e9fc4c33c1daedb32d6a052f18901 SHA-1: 4403d49f68b09232fbadccd3377efdfb9950aa04 SHA-256: 339a406cf9c1322aed9ef3b6a8c0c7c1d4c338ab9b59f414807d93ae43000419
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many hosted on compromised or disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious content or exploit kits. No scripts were extracted, but the PDF structure and URL patterns are indicative of a phishing or SEO poisoning campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://garglob.ru/uplcv?utm_term=organic+chemistry+2+pdf+notes PDF link annotation
    • https://vieclamlaocai.vn/webroot/img/files/83889685145.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/45981559941.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607879fa87735---1102719422.pdfIn PDF document text
    • http://hanbangrd.com/userfiles/file/20210730021009_1322147893.pdfIn PDF document text
    • http://autofox.lt/ckfinder/userfiles/files/xovobutozi.pdfIn PDF document text
    • http://vrieshorst.nl/images/uploads/file/62763723948.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/d029e4212ee453d1b24f20250a1c8b3a/kagotalagafu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607db30ad8e8e---24443133118.pdfIn PDF document text
    • http://lhdrum.com/User_File/UpFile/file/20210705173336_MzExODIxMTUwNjU=.pdfIn PDF document text
    • http://clase86marista.com/clients/25276/File/walupajurujilaruk.pdfIn PDF document text
    • http://cbstav.cz/file/30137647980.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/35991383887.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160926fd422047---41766518442.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/1a40bf5631b529f53763d23d3117f3eb/lefobezaxu.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/15955336218.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/6de917ecb315897ec76395ed1f6bacee/losadamodetikesokufifalej.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/67411940968.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/89dfea3bdf96ce415623bc316c499da1/77389022541.pdfIn PDF document text
    • https://creativitagh.com/pevron/www/img/file/rebejefep.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b85e53e4e2c---75262401737.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/07b69c65b30af0cc391739172434e0aa/rokewurarenemexoroferife.pdfIn PDF document text
    • https://dichvumayphoto.vn/webroot/img/files/vejubefoz.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d06c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD06C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e883.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE883 11280 bytes
SHA-256: f5957fd7cf07a3f3bf2c15e8f9c85433a69353de19c091bc7f7cb66650107164
font_02_sfnt_off000102bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102BF 18036 bytes
SHA-256: f4eb8aecfc4ad1f2dae971a669dc73aa3713ce0b2990b36a61b70a8e4a82c834

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