Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b69f57b012fb68d…

MALICIOUS

PDF

85.8 KB Created: 2021-09-17 17:34:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 16a92df175cc8e73e6ae75ca1bf11c69 SHA-1: 3a5633168de5252b76a309ad061137b879705876 SHA-256: 1b69f57b012fb68d06bccc374156270b060e3201fbca7d1c63c01938f31adb45
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many of which point to compromised CMS upload directories or disposable hosting, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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.
  • 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://raczcsalad.hu/files/munore.pdf In PDF document text
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/nuvenopotuwizune.pdfIn PDF document text
    • http://edituj.cz/res/file/83999390888.pdfIn PDF document text
    • http://magdrywall.com/project-new/christianbook/upload_images/file/kamenapujamud.pdfIn PDF document text
    • http://proclima-membranes.ru/userfiles/file/fapebiripedomivenadikuz.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/diger.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613c9cc623693---67469468286.pdfIn PDF document text
    • https://inwestorfinanse.pl/userfiles/file/zanegameg.pdfIn PDF document text
    • http://highspiritsmusic.com/ckfinder/userfiles/files/29647671262.pdfIn PDF document text
    • https://www.psk.com.au/application/third_party/ckfinder/userfiles/files/81808244502.pdfIn PDF document text
    • http://nattuvaartha.com/assets/ckfinder/core/connector/php/uploads/files/bakazaxetepenoxisezeri.pdfIn PDF document text
    • https://regiefranchet.fr/userfiles/files/daduzite.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/fovitor.pdfIn PDF document text
    • http://deshdunya.com/blogimage/file/sodexebezor.pdfIn PDF document text
    • https://alebusph.centralcms.cloud/galeria/files/21168481012.pdfIn PDF document text
    • https://tempegaring.com/contents/files/vavupomuvigejafogebumiz.pdfIn PDF document text
    • https://ketdoanbus.com/webroot/img/files/65776413601.pdfIn PDF document text
    • https://coluer.ir/documents/file/jaditizetori.pdfIn PDF document text
    • http://psn-monolit.ru/img_file/files/wemugadasow.pdfIn PDF document text
    • http://didula.com/img/file/dezikebagimumuxatiz.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/161311648ab5d4---51912718650.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/452587ee0c3b7aa2541259102639afd2/noboxi.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc7ce16bba---gowomezuzar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=best+personalization+apps+androidPDF 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_off0000ed0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED0F 17180 bytes
SHA-256: f27a2ea7fc23f6cb433477b4e0389920802db549d0c664730be8a6c47789ad61
font_01_sfnt_off00011975.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11975 10496 bytes
SHA-256: 0a6c774938dd99e5eacc814c5e8cf5be2fcbcaae57632a62b26f6e73111abb7c
font_02_sfnt_off0001317e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1317E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1