Malicious PDF — malware analysis report

Static analysis result for SHA-256 321649b134b3cbaf…

MALICIOUS

PDF

85.6 KB Created: 2021-07-04 09:46:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 38100a3312b6ac6093a1bdf3abc1a1f3 SHA-1: 8b36f96ae72dbd52cf225df5dd0006f82c0a277b SHA-256: 321649b134b3cbaf0da279e025c655cb76df8cb643fe06d544f96eb469b20f54
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the heuristic firings clearly point to a malicious link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://tungqibiotech.com/upfiles/editor/files/36853569887.pdf In PDF document text
    • https://roweryelectra.pl/app/webroot/uploads/file/16245423918251.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609b98d29c77b---21443763916.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/kgha3d17qak4nq0q6gkrvs2b26/36090425472.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16079dccbeb14b---8217442641.pdfIn PDF document text
    • http://jtipartner.com/ckfinder/userfiles/files/fokutujefimanevu.pdfIn PDF document text
    • http://euro-ex.com/movijub.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/7339434882.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/zazuvositifenikorilekajo.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a1d32a5ddd5---49111536818.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/290554307999.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/huvgderppe7edal7borf84ogo1/xamojalixuwomomesavu.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/ec7718bc9efee86ff99bbc0fba87de1e/52756611842.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/gafelosirelumewafolofoz.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/e292876aad8aa9efe9088d09006ae998/84824324616.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a92aec6f232---wamalepitegibupanagi.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c77e0b33e7---60265685470.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/90571307225.pdfIn PDF document text
    • https://photojet.bg/userfiles/file/tijifipemibugoralemojul.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/32a7a2a3af492d1a5187753b6f95ea13/zoxigetifepizomenisapo.pdfIn PDF document text
    • https://przyklejki.pl/userfiles/39936205922.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/9d05d6037de347ddc774cf7e731533f1/wagumuxinifobuwu.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d3c8344d527---zufiriradezomubebux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=2013+hollywood+movies+download+in+isaiminiPDF 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_off0000e7e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E4 10948 bytes
SHA-256: 2a45c916d87e7eba13455215e8290b14bd8c13ca631e6769ef4cd0c9a1e87d75
font_01_sfnt_off00010134.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10134 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011946.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11946 18164 bytes
SHA-256: 6cf89601a10fe7aade587c38bc3b550501e45134ceac71a55f72cc4063f0aa3a

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