Malicious PDF — malware analysis report

Static analysis result for SHA-256 34be6c204b23c3e9…

MALICIOUS

PDF

72.8 KB Created: 2021-09-06 14:05:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: df1f23480d1e36f12b7f56aaf8c71d45 SHA-1: 8954caff7e9b0dfb3e53b252ec4b4bc67527997e SHA-256: 34be6c204b23c3e92cbfe1acdd3a38849e09e026c155d13cc62b562479e542ec
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/4c0c637498b87ac1ba13e11f8fef3774/vutat.pdf In PDF document text
    • https://zerling.eu/nico/images/files/79679456327.pdfIn PDF document text
    • http://razaviota.ir/basefile/razaviotair/files/tugiguroletoxixekewute.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160a49f9180110---31156068955.pdfIn PDF document text
    • https://www.bussmann-tiefbau.de/ckfinder/userfiles/files/89507618870.pdfIn PDF document text
    • https://acavacecio.it/userfiles/files/bedasesuxujukiwodo.pdfIn PDF document text
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/tuwunulizeko.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/xatikuwodoke.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/25913035009.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/oimot296i3fkfvvmo6e8k2og75/mefosetutovimalulog.pdfIn PDF document text
    • http://www.s4b.nl/upload/files/jilipibisoxonu.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1e3920a780---19944949614.pdfIn PDF document text
    • http://kukubara.com/zdjecia/file/69848785155.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16103234dd9942---lininawojoferon.pdfIn PDF document text
    • https://kmkmekanik.com/upload/ckfinder/files/suzixevafesu.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/ff315b776bf1526e665e83065c3ec791/70183920072.pdfIn PDF document text
    • https://2-view.org/home/view/public_html/ckfinder/userfiles/files/30944130136.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072811798ae4---70446767591.pdfIn PDF document text
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/ojuel9ma30ccu3hbg1f5ooiqos/1625531873.pdfIn PDF document text
    • https://fundacionamigosdelmarcaribe.ong/ckfinder/userfiles/files/89013183324.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f1b80e2cfaa---49273101520.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/27810516837.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=gaya+bahasa+perbandingan+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_off0000ba34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA34 10808 bytes
SHA-256: 81932b8aff2fa5247ff0395917d4616095dcd47031b0fc4d15f9bdf075e92565
font_01_sfnt_off0000d2a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eab3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB3 17060 bytes
SHA-256: 3d96f530b85956fb636e0e2e49f810c74364106aa5dae6282e5ccd9571a85b27

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