Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b3374696d130930…

MALICIOUS

PDF

84.9 KB Created: 2021-09-03 09:14:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b621e4d5c513e1cd40d4e76dc5a3a186 SHA-1: befa02eb3c67dce80c8f41b0e92a6dcf17f1f533 SHA-256: 8b3374696d1309300d84356b72a38eb3b85c78097335795638c6ecd36252e1a7
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various websites, including those hosted on compromised CMS platforms. The presence of these links suggests an attempt to lure users to potentially malicious sites for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://almondzwealth.com/administrator/imagetemp/file/27574270643.pdf In PDF document text
    • https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607210fdcb85c---mumifirug.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/41d79eb777e1cc7b8be9777720dd659d/vanolodaluredap.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a7cc3a9e93---wimajejukepu.pdfIn PDF document text
    • http://gzperson.com/uploadfile/files/49251003423.pdfIn PDF document text
    • https://selispin.com/calisma2/files/uploads/tovukodip.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/kaditokadifekudulita.pdfIn PDF document text
    • http://kaies.cn/upfiles/file/47299761667.pdfIn PDF document text
    • https://drivetripper.com/userfiles2020/files/14485952508.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/lulesulukofiluxuk.pdfIn PDF document text
    • http://lanaecoloridabruzzo.it/userfiles/file/xaxelowijodaxu.pdfIn PDF document text
    • http://jmestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lifipimexezufogulojameg.pdfIn PDF document text
    • http://nicolalazzarotto.com/userfiles/files/23637105668.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a16ab449f0---luxomibefoferigili.pdfIn PDF document text
    • http://noospc.ru/SITE/files/editor/file/godopibaviwumib.pdfIn PDF document text
    • http://adveotec.com/img/file/25886994740.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1611eb4542a206---wodidaxevogajiju.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/stklroa6cbgq3o4hf1thirrvhm/31534386987.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/471ec0af267fe89e3cd2167e660b25f9/mupepedo.pdfIn PDF document text
    • http://amouage-salon.ru/admin/ckfinder/userfiles/files/11809599334.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210831121511559.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608b2b2ae3582---57457299045.pdfIn PDF document text
    • http://amindoost.ir/images/upload/files/rowopikafub.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/9bb1b78cac930e7a2e491eee336b1b88/58062010850.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=network+analysis+notes+vtu+pdfPDF 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_off0000e3c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C3 10928 bytes
SHA-256: c7c6195de708ccc415ea2b676a7fc77b2666c031d419734c4aad8588d548fcf6
font_01_sfnt_off0000fd45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD45 18684 bytes
SHA-256: a96ad5ebfedcd6e028e47a3d15a862836360368d8fd12b670a8c569460339c9b
font_02_sfnt_off00012d74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D74 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1