Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd3a432d856c695c…

MALICIOUS

PDF

69.0 KB Created: 2021-09-25 10:15:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 868b3460a0c1fba551e8efafcd50d26f SHA-1: 43ef64b70af9d982f6091dc363add15212bdd07f SHA-256: cd3a432d856c695cbc22210382399820dfd86d0d16b2f4ad00920f694356580c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting or compromised CMS upload storage, indicating a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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
  • 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://infrive.ru/uplcv?utm_term=saab+bahadar+watch+online PDF link annotation
    • http://fobas.cz/userfiles/file/45038346089.pdfIn PDF document text
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/75135619965.pdfIn PDF document text
    • https://gonguyenkhoi.vn/upload/files/gidevogasij.pdfIn PDF document text
    • http://azstorestudio.com/uploads/files/pubow.pdfIn PDF document text
    • https://gtsk.solar-napkollektor.hu/js/ckfinder/userfiles/files/xagotaxokebix.pdfIn PDF document text
    • https://inprovitvenezuela.com/ckfinder/userfiles/files/92004389450.pdfIn PDF document text
    • http://remobudostol.pl/pliki/jogogujonevebevorixus.pdfIn PDF document text
    • http://www.ujepites.hu/userfiles/files/fupowiduwusizuju.pdfIn PDF document text
    • http://ekbdrive.ru/ckfinder/userfiles/files/sovezulelokebitusarilet.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd7b4a9077---11119881096.pdfIn PDF document text
    • http://kolbiko.com/images/uploads/file/89155596265.pdfIn PDF document text
    • http://tucsokszekszard.hu/images/news/file/gotawixikomujanidexow.pdfIn PDF document text
    • http://www.depomatrial.com/file/lomutawoguzuse.pdfIn PDF document text
    • http://grandp.ru/userfiles/file/xakase.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/nixaretazexomuwifo.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/88d80b16e494d35f444e7486a397b49a/pigemuduxal.pdfIn PDF document text
    • http://prime42.ru/userfiles/files/90368966644.pdfIn PDF document text
    • http://rklatex.com/userfiles/file/raroxomenadafanubazitab.pdfIn PDF document text
    • http://abw10thstreetne.com/uploads/files/4326679991.pdfIn PDF document text
    • https://www.lipca.com/ckfinder/userfiles/files/girorojafolabiravuvonutel.pdfIn PDF document text
    • http://av-jet.ru/userfiles/file/megutemalajelojakobaju.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/c7c80b71d1ffc4f34835286a5212cad2/fumisotosujesukif.pdfIn PDF document text
    • http://eikenhorstgroep.nl/userfiles/file/96808302828.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000af30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF30 10600 bytes
SHA-256: 9e581c66841417bfeeb5e3842fe162377e833bf6b39fa7a3b0469a34e3601845
font_01_sfnt_off0000c759.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC759 15428 bytes
SHA-256: cb694152beced096b8c03941cc42e7855073e3f1ed320b46bc07defef7ac0524
font_02_sfnt_off0000eed7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1