Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb03dc6a326ec715…

MALICIOUS

PDF

82.4 KB Created: 2021-06-28 23:51:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a07131945eecc2b9cfa3e20b39a56468 SHA-1: 8a62188a4639b1bebe97f4c9654f3f4ee0a67c43 SHA-256: cb03dc6a326ec715d6258400f851777e6b1ea5f7ee986499e7f41a5ed13cf7d1
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised websites that likely host further malicious content or phishing pages. The presence of multiple links on potentially compromised CMS upload directories suggests an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/27008d371939f7529cbdc86525650d37/wisufewojuxif.pdf
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160728966b79d0---zivip.pdf
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c694b63e34b---tobeviwavodosiguzura.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/60f1357574523340f45ecaa5dd162899/82576550941.pdf
    • https://bandotrading.com/uploads/file/lekidipugukemededin.pdf
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/2efdb3699fb230619b6bdb24e92d4e96/90071258738.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d80a101379---gidiposip.pdf
    • http://banlinhkienlaptop.com/userfiles/file/xenididak.pdf
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160888f5927d97---64623461378.pdf
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b11a3000a84---38683584665.pdf
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0e838f8a4---favifi.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16070b7201ac83---kojisafijonoluzu.pdf
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ac41e1c5e60---59098171547.pdf
    • http://asja-doll.ru/userfiles/file/24913571038.pdf
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607af5a0c654a---wisatafudenoxikatiwuv.pdf
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/5fec131b821d23bbf8baa7f74f87b61f/68515196741.pdf
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c174c60cd---nusenef.pdf
    • https://medtek.vn/storage/file/52345324661.pdf
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5b4593746e---pajixubipox.pdf
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160723ef8c136d---tazozaz.pdf
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/cij8tdfl50cldu5bke2pfr1h7o/tanipalavetav.pdf
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7a632c28f6---79042131554.pdf
    • https://soudurelausiere.ca/upload/editor/file/zasenob.pdf
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/79e9a7be9ded1f05ff75b06c9d85c559/gegumotivojop.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=a+history+of+knowledge+free+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e005.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE005 16792 bytes
font_01_sfnt_off0000f817.bin
98163691d0402ed76cbc7c38668bab843aec8fef04f6d209b59a0c47cda3bc34		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF817 16704 bytes
font_02_sfnt_off00012372.bin
ab3fb2d5cb9370d19aa3fd0a565cffac352f8ce919293f7bde6d51f81b5eb206		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12372 10888 bytes

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