Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e2379e9e7d96d82…

MALICIOUS

PDF

73.2 KB Created: 2021-08-28 00:57:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: e1115ee7c0ff5120b19220823e1a5f80 SHA-1: 262e4fec8a5fd4073ad33abf434c2ed5e6f660a3 SHA-256: 6e2379e9e7d96d8249cbff02e2cd786bc61221c46148695a3533440531505aed
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of multiple PDF link farm heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://usateatop.com/_upload/files/buwotifijur.pdf In PDF document text
    • http://hanabi-la.com/uploads/files/salenumideko.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e79878c521b---23374706212.pdfIn PDF document text
    • https://samarthanamparisara.org/apadmin/uploads/userfiles/files/8968215742.pdfIn PDF document text
    • http://ropesadventure.com/d/files/10796326718.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/detuko.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/be81f77869a34c378a9f3eee24f9ed34/71348765137.pdfIn PDF document text
    • https://ruxthai-guesthouse-chiangmai.com/ckfinder/userfiles/files/70583770486.pdfIn PDF document text
    • http://www.koeru.eu/failid/file/8406904382.pdfIn PDF document text
    • http://kredoteka.ru/uploads/file/jadapamilokul.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/wutepekadodokija.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/719702f3e23ac70e1b69f7c9424e1fa9/jidoma.pdfIn PDF document text
    • https://htlexpress.com/ckfinder/userfiles/files/90063560078.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/07799c152a32498fdac75a97c674380c/damavegore.pdfIn PDF document text
    • https://bartonsteel.com/tony/barton/ckfinder/userfiles/files/kosijejuwawijinaleligefu.pdfIn PDF document text
    • http://wahibluedevils76.com/clients/5/55/55d7338a7abcce318bc847d7f34994f5/File/96363027729.pdfIn PDF document text
    • http://bikipvuikhoedep.com/app/webroot/files/editor_upload/files/vavineratakuraz.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/qpnk88iedebbssbh69819c9ah4/65465132113.pdfIn PDF document text
    • http://modernplating.com/userfiles/file/ribanesirimaxesuvuv.pdfIn PDF document text
    • http://zxsolar.com/d/files/6289293285.pdfIn PDF document text
    • http://kojeneckezbozi.eu/userfiles/file/83343924920.pdfIn PDF document text
    • https://yodobashi-church.com/30335254905.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/ff7360f9fdc60cec8e48b96ec614c60f/ravimozadejatom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=video+buddy+app+download+for+android+apkPDF 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_off0000bc23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC23 16204 bytes
SHA-256: 3596e27e580e46861b29e6d28f230ede82741d2510e8825fd84a2819a2c8377a
font_01_sfnt_off0000e597.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE597 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fdae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDAE 10728 bytes
SHA-256: 8b5fabb11f8d5648065620d3894f1fbb0d73dbc888fda5898a2b311e20684fdf