Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a9d3e9de9275577…

MALICIOUS

PDF

128.4 KB Created: 2021-08-03 12:03:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6b97f01f739534309945f646f8990ef3 SHA-1: 25160a410005721999b57054d909e1042583ca1e SHA-256: 3a9d3e9de9275577548919a1894f512d013e913ccb5997f346eb5a9cd343dc56
156 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains a link farm with numerous URLs, many of which point to disposable hosting or compromised CMS uploads, suggesting an attempt to obscure the final destination. The presence of external URIs and a link farm indicates a likely phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://htapigroup3.com/contents//files/duwudevudosavekewejesavom.pdf In PDF document text
    • http://teerosy.com/ipp/images/uploads/files/40113983825.pdfIn PDF document text
    • https://kaimano.it/file/79187171722.pdfIn PDF document text
    • http://ordinate-ltd.com/file_media/file_image/file/ruranititajejin.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/ca73c1a3ae00a33247ba0c1b5740f34c/pasojemi.pdfIn PDF document text
    • http://hillcresthigh1971.com/clients/9/9f/9fbf9047a6869172a982db6f42f05a9a/File/68661695416.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/56220860773.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608623c01ad70---dosogixobikujuvosur.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c51d95cf1e4---10532889275.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/de57cafea12963a4a2fb28228666dce2/91802089985.pdfIn PDF document text
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/25040667222.pdfIn PDF document text
    • http://eastendmediation.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/felomutuxeso.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a1b6d6971d---rizoxuligamusizixefupego.pdfIn PDF document text
    • http://righetti-ticozzi.it/userfiles/files/kunuminudubaxonirevewow.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/374v97t9kg9kirif7c4m3ieqlm/50104267274.pdfIn PDF document text
    • http://uptownherndon.com/uploads/files/gawas.pdfIn PDF document text
    • http://maskaevlawyer.ru/userfiles/file/worerad.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/89aec68c5735b2da61ff54eca653d361/pugodexo.pdfIn PDF document text
    • https://khanikango.in/file/dewanovunaruga.pdfIn PDF document text
    • http://www.siposferenc.hu/html/kigupavudegirisotoma.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160958ac367196---20930792571.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/531a8480aeea0e31f62abf7e0672e3b6/16826256419.pdfIn PDF document text
    • https://goacetours.com/ckfinder/userfiles/files/lodumomiputamupavebifem.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160914dd39ab50---31334327492.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/phk47oo3b3bk1piks33ikvm02c/70633390294.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=hamilton+county+ohio+arrest+reportsPDF 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_off000195ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x195ED 16676 bytes
SHA-256: 87999f2a825d07bdce470a0d967b6e8f565bca5be4e86e5d5654126bbe52145f
font_01_sfnt_off0001c17e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C17E 10844 bytes
SHA-256: 970d915c16d3b0db00dae19a7b14740604364ac6cb3dbe7edb9a93f62329ed17
font_02_sfnt_off0001da52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DA52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1