Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dc51e6354921741…

MALICIOUS

PDF

72.2 KB Created: 2021-10-08 00:47:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 01d07386296f57bbc3abe46098c42942 SHA-1: 545cfedfa7eabc50bb7f7716207f693e6b5d6cb3 SHA-256: 3dc51e63549217411da05e5ae3262713d64fe062bcfa20cccf38aa51c8af4482
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file exhibits characteristics of a link farm, with numerous embedded URLs pointing to potentially compromised websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the structure and URL patterns suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/0f1f39a1ec7dfa43f34eefd408850220/96385807454.pdf In PDF document text
    • http://3e3i.com/UserFiles/file///84278638700.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/161450c4419f51---dovedi.pdfIn PDF document text
    • http://casaatlantida.com/userfiles/file///62099139571.pdfIn PDF document text
    • http://accutindustry.com/Upload/files/20210919224744.pdfIn PDF document text
    • http://toyotarent.tw/FileData/ckfinder/files/20211008_D85DE7C1DC3C2FDE.pdfIn PDF document text
    • http://donovaly-ubytovanie-safran.sk/web/userfiles/file/17792817443.pdfIn PDF document text
    • http://ahzycw.com/upload_fck/file/2021-9-15/20210915181829997096.pdfIn PDF document text
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/belaro.pdfIn PDF document text
    • https://anitt.in/ckfinder/userfiles/files/90050910440.pdfIn PDF document text
    • http://thetestmag.com/userfiles/files/pawesipurokegofuko.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/e6666c1c443af2f49c97b62af419dbc2/rinenuwajulanap.pdfIn PDF document text
    • http://advocaatindex.nl/images/uploads/52271080624.pdfIn PDF document text
    • https://vvpta-irvine.org/userfiles/file/ronaxilewukozatazexikezu.pdfIn PDF document text
    • http://asesoriazabalburu.org/azaba/files/file/3186652587.pdfIn PDF document text
    • http://cutyoursupport.com/userfiles/file/29114203532.pdfIn PDF document text
    • http://dga.gr/ILC/img/file/jifunodofikivadudimegi.pdfIn PDF document text
    • http://aczelzalog.hu/tmp/sowesotorojixan.pdfIn PDF document text
    • https://blugarden.eu/file/50312303337.pdfIn PDF document text
    • http://toonesk.com/upload/ripuwivanad.pdfIn PDF document text
    • https://rais.bg/uploads/file/kezozogo.pdfIn PDF document text
    • http://udokutscher.de/gfx/userfiles/files/14409057863.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=pesticide+analysis+in+food+products+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_off0000b5db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5DB 17356 bytes
SHA-256: 9742cc199314a83dd669d5c197c48a6e62daf9e72693443481e5d5d221894514
font_01_sfnt_off0000e230.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE230 10828 bytes
SHA-256: 79cccf2cec88d07ad7a5dd845638876da99ade8c273af816fa344998eae43360
font_02_sfnt_off0000fb56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1