Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7fd4f413998e9cb…

MALICIOUS

PDF

81.0 KB Created: 2021-09-08 07:14:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 905e54e30a89226a0ed60f0ce6fd188f SHA-1: 68f1fa292527ee1c0bb1b65aa62266d59e69035f SHA-256: d7fd4f413998e9cbfdbf517b545f8ec824f9bed070f41f02cf7f4d78b25ea6c9
164 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous links pointing to compromised CMS uploads and disposable hosting, combined with a visual download lure, suggests a phishing or malware distribution scheme. The document body is heavily obfuscated and unreadable, but the overall structure and URL analysis point towards an attempt to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ipekyolumedya.com/resim_galeri/file/fuzinedidosazadusad.pdf In PDF document text
    • http://panyuchen.com/ckfinder/userfiles/site_eachfun_com/files/41171125154.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e0fc765dd---17041033330.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/02b64e5ed6fb1f4ed567bd3164e0e5db/muliwedetamesuwozefaj.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a65e7c86aa2---vomerijedisotikepuwubut.pdfIn PDF document text
    • http://candientuvibra.com/images/file/nebozupevif.pdfIn PDF document text
    • http://bfcy88.com/uploads/files/diruremozizotetalatuxesej.pdfIn PDF document text
    • http://adidravidar.com/ckfinder/userfiles/files/wabafemuvigipakar.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/jabazupomemulibozi.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/cdae3579950b53f491ab52f2f48f141a/bunozenakupov.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a0bc6f627---47997399363.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/44225817974.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/cbn6ohee34stblrmmqn18kncn3/kizewetumuzapomirupil.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609284774219f---24318448775.pdfIn PDF document text
    • http://sriagasthiyarastro.com/FCKeditor/userfiles/file/zuripoparexepesesuwigi.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/58ba6a5e93700100695141b32cb8ca3b/kosilafosixokosavanor.pdfIn PDF document text
    • https://rabudiagnostic.com/userfiles/files/bogafoferebinirakobaj.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/99070604149.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/5253cf84040d6f34e8cf7a188d172f58/54095066243.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/23693222857.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aebd9108e5---givolozosajik.pdfIn PDF document text
    • http://royalrep.com/userfiles/files/nakubanoxedetofumi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=java+programming+examples+pdf+downloadPDF 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_off0000d769.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD769 17728 bytes
SHA-256: defec9fc144b569d26e006086d80b33dd0cd937db66c2b71f65735e6c6588083
font_01_sfnt_off00010553.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10553 10988 bytes
SHA-256: 5aab28a26ec8e06624793e775dcde884efa6856487251f7b96e8cb174d747fa5
font_02_sfnt_off00011eb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1