Malicious PDF — malware analysis report

Static analysis result for SHA-256 51464a649eb9fb0a…

MALICIOUS

PDF

69.3 KB Created: 2021-09-01 07:00:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b0fb4eed48b1fb99445369e69fdc0fe9 SHA-1: 496a9ee9e1e4ef8adcf385f71b57f0295257c3ce SHA-256: 51464a649eb9fb0a6991fc935fe232256ec1a71ff7dd86ca9896dbbf03dc468b
154 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 numerous URLs pointing to potentially compromised or disposable hosting. These links are likely intended to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7076

Heuristics 5

  • 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
  • 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://chongtham68.com/app/webroot/uploads/files/pugixigilejoroxuxexuvut.pdf In PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f452c53bce---botegukinelubisetosoxaka.pdfIn PDF document text
    • http://johnmarzillier.com/ckfinder/userfiles/files/37484043567.pdfIn PDF document text
    • https://warsztatgdynia.pl/app/webroot/media/files/soterolibaniduritepob.pdfIn PDF document text
    • http://hotelniagararimini.eu/userfiles/files/fibujepemewabegupekav.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/97486504556.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/dukawibavifaroxi.pdfIn PDF document text
    • http://www.hausman.eu/images/wyswig_images/file/mijepaxepoxeketusofutaju.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/ef3f759bd61953016ff324f1f77a00cb/89339410716.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/2a1952669c43854cc72feca0ba0deee6/9173041522.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/57293694458.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/3c9e1b06ce911406722280f27a7c7f9f/18382692888.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f541fdecfe---15540173004.pdfIn PDF document text
    • https://rajatotogroup4.com/contents//files/fukudedaposobapidez.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a27fd9e61b5---96115373048.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090544bbca14---92302257924.pdfIn PDF document text
    • http://thefertilizerequipment.com/d/files/luvixarubixijibibasurexu.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/e1b9d37fb2bd680f91cf25dfa07450b3/kokamukejo.pdfIn PDF document text
    • http://aytekinpolatel.com/image/files/damesufajoko.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/76133266104.pdfIn PDF document text
    • https://hnhaa.com/userfiles/tnejp//files/97768289429.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984fa36a0d1---gitezatokiperogugadoze.pdfIn PDF document text
    • http://geotersrl.it/file/rukedafazasifisuve.pdfIn PDF document text
    • http://prinsart.ro/uploads/files/69415205155.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/a7056ddfbbc5c5c98dfdc1c3404f1328/valijifax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=thesis+statement+texting+while+drivingPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ffd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD4 10792 bytes
SHA-256: c322c93af0e24b0e938a8d065c6d7dd98d1f81fdd53ad2f89d5beba662d3ec90