Malicious PDF — malware analysis report

Static analysis result for SHA-256 606246652ac6df4a…

MALICIOUS

PDF

70.2 KB Created: 2021-09-26 11:35:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: e4ff1b80eb85d004911c07efb03ea389 SHA-1: 3662f924290d7cbd127ce130e21f5c72a6f52fa7 SHA-256: 606246652ac6df4a830ae7f7cef25dffbbc01a89198a8280c3c7b5728423f158
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF identified as malicious by ClamAV and an ML classifier. It contains numerous URLs pointing to compromised WordPress sites, suggesting a link farm designed to lure users to potentially malicious or phishing content. The presence of external URI heuristics and link farm indicators supports this attack pattern. No scripts were extracted, but the overall structure and URL distribution are indicative of a phishing or redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c250cca7e2---panowufotutanekixomo.pdf In PDF document text
    • http://daisytalavera.com/userfiles/files/fanomawe.pdfIn PDF document text
    • http://wadsoda.com/UserFiles/File/xerifokumixidafokan.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/bc0cee18a53e26130132e29f9f5b8ffe/23891406228.pdfIn PDF document text
    • http://avanti-kuhni.ru/upload/files/58409057997.pdfIn PDF document text
    • http://rm-centr.ru/uploads/file/nazipiroketususezila.pdfIn PDF document text
    • http://sungwoneng.com/upfile_editor/2021/files/84964813281.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/33061135301.pdfIn PDF document text
    • http://addon-colsman.somantec.net/ckfinder/userfiles/files/ruvuvuneritawobet.pdfIn PDF document text
    • http://wideanglepackaging.com/ckfinder/userfiles/files/20665480624.pdfIn PDF document text
    • http://www.cpnatacao.pt/backoffice/ckfinder/userfiles/files/lakivabevabuzi.pdfIn PDF document text
    • https://www.dogandemir.av.tr/paketler/ckfinder/dosyalar/files/jilanulaxubaguvus.pdfIn PDF document text
    • http://technocom.pl/editor/file/dowesim.pdfIn PDF document text
    • https://bhopalliteraturefestival.com/mpsdp/uploads/files/61811583396.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/161323ef88d587---xawetoxevomomu.pdfIn PDF document text
    • http://hermanosgolbano.com/admin/fckeditor/editor/filemanager/connectors/phpfile/kizaz.pdfIn PDF document text
    • http://akwarella.pl/user_uploads/file/sivegutoduga.pdfIn PDF document text
    • http://fecoil.com/userfiles/file/38241146616.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612f873f4e2a9---geziritanuduzerigipadisax.pdfIn PDF document text
    • http://danceaction.be/userfiles/file/14344736507.pdfIn PDF document text
    • https://rubenoferro.com/userfiles/file/92692135877.pdfIn PDF document text
    • https://manhalhealing.com/userfiles/file/38225064736.pdfIn PDF document text
    • https://x-software.cz/data/file/10366613855.pdfIn PDF document text
    • http://xlpe.net/Images_upload/files/dofedujapoposavolixo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=my+best+friend%27s+christmas+movie+online+freePDF 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_off0000b125.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB125 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c93c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC93C 11088 bytes
SHA-256: d666f0b1cbd1a3ca680fb30b9a03c141da578cf6834e87b7717a246fdc9c1e17
font_02_sfnt_off0000e2f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F6 15652 bytes
SHA-256: d700e823e0640928980afcfa8a7c55165c438c787b93d250d01e2b158377b1ef