Malicious PDF — malware analysis report

Static analysis result for SHA-256 e609d9e3f040086a…

MALICIOUS

PDF

79.1 KB Created: 2021-09-01 20:06:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 291cbf3d8b81b3023223f68d2af34a76 SHA-1: 75fe3c21aac43bc71a70b80bdef7d990be941b76 SHA-256: e609d9e3f040086a4fd320f090bb66faa1c97ca87477daa16e5ff0364fdc76da
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated and does not provide clear instructions, but the presence of multiple links to potentially compromised sites is the primary indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://serka.com/serka/upload/files/naledi.pdf In PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/7ff62b96632e71042a97fe39e4502e54/rudebigumoxanowatelejiwod.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/1112deb9112c47fce25e88c27db1af7c/32774646499.pdfIn PDF document text
    • https://cahayamimpi1.com/contents//files/92512851974.pdfIn PDF document text
    • https://aalatour.com/basefile/b2caalatourcom/files/53622457024.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/fd35a817aca3556ebe1ad2b2ea075019/40994822244.pdfIn PDF document text
    • http://bannails.com/fckeditor_userfiles/file/gewumabovevapepewuwi.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/cdr2u0tijr1jrs1ki8pflo8v4p/dedujogusobegeburojerob.pdfIn PDF document text
    • http://stensoproject.com/userfiles/files/58141224317.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/7v28rhmesaf67n5sfdmjen1r1b/fasewemenuseduturuka.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/75897168386.pdfIn PDF document text
    • https://www.espaciocultivarte.com/ckfinder/userfiles/files/zafetile.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072e92a2ba87---wokusalosenanujina.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/a20fa3689f2477deaa62151f85d9661b/378516751.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160c0df8dc8123---87312757430.pdfIn PDF document text
    • https://songhong-thudo.com/img/files/3662724411.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/50597367167.pdfIn PDF document text
    • http://daglichtfilters.nl/ckfinder/userfiles/files/kijoxiwa.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/lqdv1tn3gqiofkal1gaa4rb0rt/noxopodegukipima.pdfIn PDF document text
    • https://larustt.com/upload/ckfinder/files/47667320766.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160822ef72ca9f---69456871268.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160aa0d61dde7f---61795331218.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/sowiraxozarabukokevo.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a4cf8cf789---53197125065.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/bopofexopejitepavilomes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=balancing+chemical+equations+worksheet+class+10PDF 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_off0000cd5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD5F 18152 bytes
SHA-256: 89363c933f700009790e5aa9ec1a2c825f58435fc89a6c908c1ec58375e5bb09
font_01_sfnt_off0000fc2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC2B 11328 bytes
SHA-256: d2d5749132efd3b3f2b4d14abf8aa9c9f6740d8e3070018b262a28633c1a5b62
font_02_sfnt_off00011675.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11675 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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