Malicious PDF — malware analysis report

Static analysis result for SHA-256 844ee13b424310f0…

MALICIOUS

PDF

86.3 KB Created: 2021-09-06 19:01:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9ccd20882ecd5d05e914132cb2e4aff0 SHA-1: c2d3fa07e85c1cc18b249e30acf5dcc914212b68 SHA-256: 844ee13b424310f0c13b9116d3bf04051e053e71831b56d4dcd8112541a6244b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and link farm heuristics strongly suggest it's part of a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf14d2e54e---renadugudi.pdf In PDF document text
    • https://rockyhotelsgroup.com/uploaded/files/vupewekapapo.pdfIn PDF document text
    • http://eltonltd.ru/sites/default/files/uploads/lafixawukajivamij.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/1e8a7139c585e5d4317cb24c588b2435/47331509199.pdfIn PDF document text
    • http://gleneaglehoa.org/images/file/naxokujesotowa.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/28fb2cb1fadcfd640a0a170e6fcaa546/21086551957.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607db73c9f38a---88268739512.pdfIn PDF document text
    • https://rimsball.com/ckfinder/userfiles/files/xedurivesamawar.pdfIn PDF document text
    • http://flgr.ru/files/files/jukemusutevakibesuvojin.pdfIn PDF document text
    • https://kudamatsu.org/userfiles/file/80746555433.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/55739668689.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/zodelubinupitamat.pdfIn PDF document text
    • https://www.gurkhasfinance.com.np/ckfinder/userfiles/files/xasokadogisagu.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/532c411840569e10a91bddcbb241e52d/bekapuxar.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/xabodapetezopib.pdfIn PDF document text
    • http://kientrucnhacuagio.com/upload/files/nepas.pdfIn PDF document text
    • http://hauptlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/litisupezovag.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c85336723f---jebuxazefagekumawugunut.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/54448164798.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/1ea803cd7afb7be6789cf91da597b832/wuxoviwafidumup.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ceefe9d4ee---biguwixitabopazalajifa.pdfIn PDF document text
    • http://totalmediasolutions.ae/ckfinder/userfiles/files/lifodidero.pdfIn PDF document text
    • https://sreekanakananda.com/ckfinder/userfiles/files/mofuminiromejeso.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/8dbea706fd98eebd138ad4b1fd945445/18499938609.pdfIn PDF document text
    • http://asustainable.com/global/file/92208183140.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=vicente+huidobro+poemas+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_off0000e965.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE965 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010177.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10177 19460 bytes
SHA-256: d4ef85aea7703a8e0a3a3f12be32f18a7100c68a4aaed240285022c9005cc511
font_02_sfnt_off00013249.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13249 11048 bytes
SHA-256: f85b036398329df6f1300445c1a056b171cfe678086c5f4cadbc8a2d80b1a0f6