Malicious PDF — malware analysis report

Static analysis result for SHA-256 9aa478378e0ecbfa…

MALICIOUS

PDF

80.0 KB Created: 2021-09-17 17:18:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9902062cf1c69355ce52df4da4d8976c SHA-1: 923e305294ed47a68ba70f1838974cbdbd1c7d59 SHA-256: 9aa478378e0ecbfa6d7d03b02d7e97c5d00b466114cf7e6a8650e12bc7c15922
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are associated with link farms and potentially compromised upload storage. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The presence of multiple external URIs and link farms suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 https://huntic.ru/uplcv?utm_term=pdf+convert+to+excel+table PDF link annotation
    • http://mdbim.pl/ubezpiecz/obrazy/file/44539808722.pdfIn PDF document text
    • http://haraj-alqunfudhah.com/userfiles/file/93250061560.pdfIn PDF document text
    • http://fashionflutters.com/ckfinder/userfiles/files/40053630178.pdfIn PDF document text
    • http://oresteruggiero.com/userfiles/files/54443441098.pdfIn PDF document text
    • http://railwaysrailroads.com/upload_files/files/26412193653.pdfIn PDF document text
    • https://astoraccessories.com/uploads/ckfinder/files/vuzejawetunugekidin.pdfIn PDF document text
    • http://georgekoldun.com/var/upload/file/47474811488.pdfIn PDF document text
    • http://dakdekkersindex.nl/images/uploads/buxutinok.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16143efd182b69---rarakopuzuzep.pdfIn PDF document text
    • http://bangiyaparishadtoronto.ca/bpt/editor/uploadfiles/talukorezisopiponi.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files/wirupijesiwowarawawozupom.pdfIn PDF document text
    • http://kibbkw.com/uploads/files/81079573074.pdfIn PDF document text
    • http://promocode.lu/userfiles/files/10047765907.pdfIn PDF document text
    • http://agriturismolataggiasca.eu/userfiles/files/11371515678.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/9ucd54gc6adl1kipq1gjp9keoi/jagaputagew.pdfIn PDF document text
    • https://lecourbe.dk/userfiles/file/52926497838.pdfIn PDF document text
    • https://bdata.vn/upload/files/tinudazejefivakakefav.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161315680ddc9d---befevajodenenadogeluxazu.pdfIn PDF document text
    • https://www.abandassociates.com/ckfinder/userfiles/files/lesipazuj.pdfIn PDF document text
    • http://rencontres-icare.org/userfiles/file/37415830004.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/161375f19f0c7b---54164057676.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/41094170320.pdfIn PDF document text
    • http://laboratorioshamalab.com/userfiles/file/pulinalajer.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_off0000d5ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC5 10520 bytes
SHA-256: 43a77ea63c5863523f22c4ca32b9e63796f1d42948af816377d6e1536c10e4e4
font_02_sfnt_off000105ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105EF 17220 bytes
SHA-256: c96eed3ac2283377d53dab6584b3bfb830ef33dfba3b6bc70c4a1123fe65e1cc