Malicious PDF — malware analysis report

Static analysis result for SHA-256 73f34618438709e0…

MALICIOUS

PDF

73.4 KB Created: 2021-09-02 23:45:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d9e05f83133bc4071b26f995617bbd33 SHA-1: 330163ac21279b5827c709ece3fdac7fd6b87759 SHA-256: 73f34618438709e0c5cf4eef733cb651116f77b82eb31392d7758ee8684593df
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. It also contains numerous URLs pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier further support its malicious nature, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5003

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://oniceh.ru/uplcv?utm_term=traduzir+um+pdf+inteiro PDF link annotation
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160812de271c8b---xebavasibutewowoku.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/70722919096.pdfIn PDF document text
    • http://suleymanporoy.com/img/userfiles/files/72360597289.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/4baa5f1775fde6809651421bbddd4824/zasudijemodewameb.pdfIn PDF document text
    • http://hyundai-dongdo.vn/images/files/48664715464.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/39jgkalkoj2kfv9qqmpptm69tr/kavif.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/380b14443f85377ea6d7b84d98340712/mulaterojunelu.pdfIn PDF document text
    • http://eldmsh1.ru/js/ckfinder/userfiles/files/70926745016.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/30557176887.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/1m1dt8edq3ouvuhsln9l9h7tm9/93291976816.pdfIn PDF document text
    • http://studiomarazzi.eu/userfiles/files/lugugigolifuxug.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba5f6814de---wivolumodudixali.pdfIn PDF document text
    • http://gtshotel.it/images/file/tozedokoviv.pdfIn PDF document text
    • https://biovuspharma.net/userfiles/files/4173212067.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/vawewotur.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/unh5kttur2sp9em0lokfsa73m1/52218915339.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a061128f64f---futifoxabuxebazox.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/7133331420.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/lijamawubel.pdfIn PDF document text
    • http://hotararicedo.ro/files/files/tapofosexuseluzobivu.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/8565eecfa0722fbe8ce0be27f54c3aa4/54098838482.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/b32bc5b209f354a4f1e29afd79a4bcbc/17218768671.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab7d078adb2---kixuketunevimigavefazi.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160efd41b2544f---85403375520.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/0e093304672f1b8456ded1faaea56a41/doxosizakaguwalevevaxo.pdfIn PDF document text
    • https://www.ideaklinikizmir.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077f6c8b0f80---suwujupetubefakovatijoj.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e75c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE75C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1