Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4729bf3e1d67c81…

MALICIOUS

PDF

84.9 KB Created: 2021-09-20 21:07:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f32ef35953ec254a9683c3f11557301e SHA-1: b527fc44b9266f65fd0fce052d89c3981cda15cf SHA-256: f4729bf3e1d67c81a11d5172cb38cc0567cf92d9968a5fe7e2f039ba4c3ad208
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to URLs hosted on compromised WordPress sites or other potentially disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. The document body is heavily obfuscated and does not provide direct clues, but the link farm structure and compromised hosting are strong indicators of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://centroolosprato.it/userfiles/files/zulibonevaviwafajopomivog.pdf In PDF document text
    • http://connect-event.fr/ckfinder/userfiles/files/retotakawibezuk.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1614383eb0b225---dofuzaxotetukiv.pdfIn PDF document text
    • https://pbchistoryonline.org/uploads/file/51870360018.pdfIn PDF document text
    • http://maekalocal.com/Maeka/UserFiles/File/48664170340.pdfIn PDF document text
    • http://ingmontagna.com/userfiles/files/rexenukovoj.pdfIn PDF document text
    • http://hotelbelleepoque.bg/userfiles/file/siwofilukotufelubak.pdfIn PDF document text
    • https://bdprescription.com/ci/userfiles/files/93244919659.pdfIn PDF document text
    • https://henuopack.com/d/files/jamagibazosefenofogom.pdfIn PDF document text
    • http://coming-c.com/userfiles/file/1434862926.pdfIn PDF document text
    • http://turinhotelcompany.com/userfiles/files/gobinipowixiritog.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161343d91bcb01---16749051621.pdfIn PDF document text
    • http://3qbuy.com/CKEdit/upload/files/dojolote.pdfIn PDF document text
    • http://sitarofindiamd.com/userfiles/file/83167350137.pdfIn PDF document text
    • http://saveondealz.com/ckeditor/ckfinder/core/connector/php/uploads/files/41912461139.pdfIn PDF document text
    • https://cdmsig2.com/ckfinder/userfiles/files/41340317549.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161482ea20293e---bidudekelifanig.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/161355f90611f3---87118651948.pdfIn PDF document text
    • https://expobar.vn/app/webroot/files/images/pages/files/lakovizaduvujajesorib.pdfIn PDF document text
    • https://bellcera.60km.com/upload/files/70649918346.pdfIn PDF document text
    • http://www.letnifestiwal.pl/ckfinder/userfiles/files/zazonidazomej.pdfIn PDF document text
    • http://fastcredit.ge/userfiles/file/11871203447.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/161437c562c794---dorejijuxupabidatujok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=ba+pass+online+streamingPDF 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_off0000e8cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8CD 10648 bytes
SHA-256: 4c485e79eaf3f760983e8d61e83e1dbfa59edc4624cc7de0d85c27cf5dc4b65a
font_01_sfnt_off00010137.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10137 17404 bytes
SHA-256: 2ce3ed4e3667eb9a1579e23405bf47c0bc1e4ebbd3cc1b65c5a54d5dfaa0c18f
font_02_sfnt_off00012e38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.