Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f69a4eb0ca363de…

MALICIOUS

PDF

77.8 KB Created: 2021-06-26 20:08:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c2b8f3492be76d924c5e43bbdb897192 SHA-1: 5b8397c402b9c9cd583e8bd3fd26e7920a4ddad0 SHA-256: 4f69a4eb0ca363de051b5eb9f201d3767130a63babdce8e082a26ae23651deff
156 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous links pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farm heuristics confirms the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb3acce7cf---84863531399.pdf
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160aaa4814a27e---45715061172.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/d6bf6a0989909b237aa62885524937a8/zimuwonugirabonake.pdf
    • http://worthingtonpark101.com/userimages/wobomazafanubitolopo.pdf
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/13996834821.pdf
    • http://edgecs.net/documents/70701833902.pdf
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/v9gc6eble12kg437u6qes1je52/32960129879.pdf
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/81j81k2rkadrmsr3lb9vogukg9/joxarum.pdf
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160ab0daa0782a---47783758078.pdf
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/6cee43326e8ed254aec5796f11889ab0/23104286387.pdf
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/de0bb70ef6d61c840d692d33dd594ef8/koviwer.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c98c08137f1---90182693719.pdf
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070bcf41f1e1---jasowun.pdf
    • http://cdseoulps.com/uploadfile/fckeditor/file/80777960843.pdf
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf2357c8e85---89927900598.pdf
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/96qrsq1nj8a92lcde701cppre4/20366455993.pdf
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/qt0ikofq4tph3ukroeajcidsn1/51853975721.pdf
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16087c6c20c5f3---35473655984.pdf
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a3c72c3ca94---poguk.pdf
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b950b08218a---jeroxagesugazofawometupi.pdf
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2c16c8577b---nalowibijifabino.pdf
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/avveee8g5l05bbv1hmugmkcmg1/ferubilubisapef.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=how+to+make+rat+in+doodle+god
    • 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_off0000cf4f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF4F 16792 bytes
font_01_sfnt_off0000e766.bin
5082b78fc2e859d6c79ba302408586f8ed537bfd9fdfae7b74a0efdcd8ad4897		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE766 10592 bytes
font_02_sfnt_off0000ff4c.bin
16906c182cd9e2df42d22054a1b5f71af16882fcef93ca1013cb8ea07f6909fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF4C 16500 bytes

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