Malicious PDF — malware analysis report

Static analysis result for SHA-256 4370912a86a0e771…

MALICIOUS

PDF

69.3 KB Created: 2021-10-03 05:30:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: addfacc8b34f2d0163064d7e0e5f3545 SHA-1: 9e09bec8996be7ed7f21de7e80b91175029dc39e SHA-256: 4370912a86a0e771dcf9dba44f9bac4f99630a29c5e6aef04159af2b74b63071
156 Risk Score

Malware Insights

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

The PDF contains a large number of links to various domains, many of which are hosted on compromised CMS upload storage or appear to be disposable. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution through these links. No scripts were extracted, but the structure suggests a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

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://laznia-radom.pl/userfiles/file/xodaj.pdf In PDF document text
    • http://svazekobciorlice.cz/userfiles/file/rupisobepo.pdfIn PDF document text
    • http://nhadep30giay.com/uploads/image/files/34392409002.pdfIn PDF document text
    • https://ph789.com/pinhsuan/files/file/62714685155.pdfIn PDF document text
    • http://njbeihang.com/uploadfile/file///2021091214034769.pdfIn PDF document text
    • http://a-mega.ua/images/uploads/file/44931118260.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135e43e2b3ae---39227961276.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/39984845105.pdfIn PDF document text
    • http://gojjang.com/uploads/files/soxukixomugujifizukapujoz.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a5c848d7a1---nuramak.pdfIn PDF document text
    • http://abwmarlboropike.com/uploads/files/jotogogazuja.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae01f6d272---xufukofenakiwesotakojorem.pdfIn PDF document text
    • http://digifast.cz/userfiles/15831757593.pdfIn PDF document text
    • http://associazionemillesogni.it/userfiles/files/53312395162.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/1378f8a763dfdf61debf57491c9161c8/godoberarovemepuxub.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/6cti8b2e4a3qkukv8je97g11s5/momidasuwuduseli.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/ion1lrh2te82r4e59641lq54r5/derezajoxovaxuxal.pdfIn PDF document text
    • https://www.autopsrus.com/ckfinder/userfiles/files/52281271435.pdfIn PDF document text
    • http://corporatiegids.nl/uploads/files/73804641687.pdfIn PDF document text
    • http://zamokugrofa.sk/admin/fckeditor/file/83809239450.pdfIn PDF document text
    • http://wohingltd.com/userfiles/labugegunaletujijogowi.pdfIn PDF document text
    • https://nezamirekhaseafoods.com/userfiles/file/95558567712.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/ribisukumetukugurerixezi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=photoshop+change+all+black+to+another+colorPDF 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_off0000af2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF2D 15108 bytes
SHA-256: 11fc3b424822e21a97249a968f6ee0925b7bd1e59c47544b2141c42196992e53
font_01_sfnt_off0000d513.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD513 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED2A 10792 bytes
SHA-256: 874395ce3d53c3f2a1167c63401edb08dca66582888a4cb265b17eab358f287e

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