Malicious PDF — malware analysis report

Static analysis result for SHA-256 96b274f12905db32…

MALICIOUS

PDF

86.0 KB Created: 2021-06-27 14:11:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c4d524feab34e57d4b2138123bf7c444 SHA-1: 20cb5f7ae94038f4878beb88859fc41df513318d SHA-256: 96b274f12905db326649bc097b6dbb113761bde0e0223d2b0b95f85901aa8c6c
156 Risk Score

Malware Insights

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

The PDF file contains a large number of links, many pointing to compromised WordPress sites and potentially malicious PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware hosting sites. The document body is heavily obfuscated and does not provide clear textual lures, but the overall structure and URL analysis point to a link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 http://mulroyenvironmental.ie/userfiles/file/vapuzatoki.pdf
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ec574d624---fubunaloxuwapov.pdf
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/a06df855cc42ba69056e1ca8d9d7f9f0/22203979715.pdf
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16085b61335702---voxipoxusimunaza.pdf
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/t34gnobt4qad1ahjssd8g3rb57/raruzexupoditumejof.pdf
    • https://altonika.pro/files/fck/file/buxogajatirirab.pdf
    • http://dongxuyen.org/upload/files/29582791517.pdf
    • http://www.urbanwaterways.info/files/71199575836.pdf
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/c7cfce43d6a8506e6dd55e6967d782e5/begozuji.pdf
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/dd2ad8841f345b2011a9b7de762ae3b3/negipetu.pdf
    • http://nhs1980alumni.com/clients/878257/File/7547281731.pdf
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098864859581---95634632782.pdf
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e51bd4a45f---62755035712.pdf
    • https://afayl.com/userfiles/file/bixujuzumaputo.pdf
    • http://abnicum.com/files/file/sudatowovov.pdf
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b91577b10f7---koxagasugaxi.pdf
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cb388cf0cc7---59196456725.pdf
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff6fb9738f---19119382587.pdf
    • http://chaitraglaze.com/uploads/gogamevom.pdf
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/6hqufv4205h9sd9ibk82ns3dq6/33570272076.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/ir55r86uei4m45ng7uh349398v/76982222614.pdf
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/4ddd1fde4605f5f4288a952a71df9b80/26205549691.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=causes+of+bilateral+pitting+pedal+edema
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/1ff41ae0aa14011fcea6898ce5432ead/wakuzawarosa.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_off0000eada.bin
fe19d76f999932684660d127f27fb5ff32cce2d27cf9e1f9d093976a5ca2d67b
pdf-font-stream PDF embedded font (sfnt) at offset 0xEADA 17536 bytes
font_01_sfnt_off00011906.bin
0f99c7bc0d4a085fee21400b68f73aaad5ce047b6bcb2cfc9abc2e055dc98de0
pdf-font-stream PDF embedded font (sfnt) at offset 0x11906 11112 bytes
font_02_sfnt_off00013285.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13285 16792 bytes