Malicious PDF — malware analysis report

Static analysis result for SHA-256 739c9b7ee9b38bba…

MALICIOUS

PDF

84.8 KB Created: 2021-07-24 18:27:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d01b6999397006599bcdd763967e444c SHA-1: 2dfaeb6c95a0e234b44c28e7a4e856d4b395facb SHA-256: 739c9b7ee9b38bbaa2d831d08f25bc76dd67b3d8e4f060fd83d53ea8b13bc6da
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal the PDF hosts numerous links, many pointing to compromised CMS upload storage and disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF format itself can embed JavaScript, which is often used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609e30ea950df---wedolokajetopimivaxurireg.pdf In PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/c7bv1hp00ebf74hg4bkluisf8u/32312790168.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/7537ed2aacb7d37248dea394a182f507/kekotege.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160e034027c9aa---rotaluzovelenunisag.pdfIn PDF document text
    • https://at-studio.tw/app/webroot/userfiles/files/20210707_010402.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/aefe21222e626d182038a978e08a5a44/11726848149.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5e1c62cf0f---joperuvenefepudibetin.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/84e2ec68e770a275d6ae850538933c3b/29318824842.pdfIn PDF document text
    • https://fertilizerproductionprocess.com/d/files/roviwuka.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ace1123ffec---35983955760.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/2d57f81698752c4e3c11a97c9b264ba9/suxup.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608b63367bead---kivesonixojodegovoguzovo.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/70468925327.pdfIn PDF document text
    • https://trips-in.com/ckupload/files/39487353687.pdfIn PDF document text
    • https://thaiwoodengames.com/files/upload/files/89594182893.pdfIn PDF document text
    • http://bangkoksolarpower.com/syner_upload/images/files/82678917021.pdfIn PDF document text
    • https://florerialafloresta.com/ckfinder/userfiles/files/54114231375.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d749b49c305---505165274.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160c202057c0bd---1846101047.pdfIn PDF document text
    • https://rh4-h1tapi-turbo.com/contents//files/nerozekomuriwivipugojiwi.pdfIn PDF document text
    • http://e-hematologica.pl/users//file/gobiwof.pdfIn PDF document text
    • http://statenbracy.com/clients/d/d3/d362857cea7b6c304c7898dd6c6993b3/File/49713600840.pdfIn PDF document text
    • http://easternsheep.by/app/upload/file/rojiponiwarudavopo.pdfIn PDF document text
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/160804b1c7fbac---vagulu.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e84c2c8829---15754760212.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a38d4444e7d---kesovixowefajape.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/58bgu929emg51omiuvnqv6m6g1/jejelagij.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/dilukegevipikiw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=examen+diagnostico+de+secundaria+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_off0000e10b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE10B 18844 bytes
SHA-256: 688851e53a67fb61a3a4c5b3d56be1da949a54dc31022d30574758c739252810
font_01_sfnt_off00011196.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11196 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000129ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129AD 11100 bytes
SHA-256: 4eeac3cea9a96b6a6b7553cd06d044de312305681bd8a0ae0a9a96d2e8a497ac

Open this report in the interactive analyzer, or submit your own file for analysis.