Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ebd8fef137bc055…

MALICIOUS

PDF

90.8 KB Created: 2021-06-27 19:48:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 3d84f69b91a4fa3bdf799f2f1787fd70 SHA-1: 2e53d4fb40ae7d2dfdcbb6401ef4ab33594dba38 SHA-256: 5ebd8fef137bc055b4aadd57d4054d8ac2a5ecafa72f0251a1d07d9ff862178c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links pointing to compromised WordPress upload directories and disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and URL patterns are commonly associated with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/smle0tljtsb9s62gt4sb3epg3c/sidusifolid.pdf In PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/df9cf5cabf80a2a308b451dfb2ddd50b/53178131458.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f2bf80264f8e2797ad2568e01507ee62/nabalekigoweze.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/t2gi3nc6tjpo8mq0dbob7e6si1/56730879070.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608a04cc0ffed---geluxujunofifetigi.pdfIn PDF document text
    • http://canxetaianhduc.com/images/file/gikewigopofutukob.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/hthap56q6lm08l9nrqkdl5aj66/bevakuxizuwubefexadifaw.pdfIn PDF document text
    • http://aqs-group.it/userfiles/files/2150772669.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/3toc5s67jfoorcm97m20ahlilu/pikowadofel.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16085872b75921---99640573534.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/dogikoji.pdfIn PDF document text
    • http://www.tecnobor.com/ckfinder/userfiles/files/nujavunemepofitidopi.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/0977590f0d1370c0af043e3e4271d27c/wulivizivolasori.pdfIn PDF document text
    • https://kovtec.pl/eurostyl/photos/file/bodojarevumakalefages.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/d958b7e6a0726811b88bc48d802c6293/bebipe.pdfIn PDF document text
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/95f986d63359417deb5dd815b6912839/75508629457.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/a40e583a5222b77b54ef946501b665fe/14939738122.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/17798569386.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/95qrtanukisb982fqik516urpc/65646693089.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d5675cd2fd---dexidesamulumedu.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/21eeg17cq9adno0cpc0jn0b0cm/jejovugevusok.pdfIn PDF document text
    • https://brickbodysupplements.com/newerac2c/userfiles/file/50638124487.pdfIn PDF document text
    • https://dascalita.ro/app/webroot/files/userfiles/files/mivogebupixenatavavemobif.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/3af6cb7f39a8f1480537751ba4f399b5/40953537206.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4cda4e207---wajugonuzerifurogo.pdfIn PDF document text
    • http://taiwanglassgroup.cn/userfiles/file/gizejigasabij.pdfIn PDF document text
    • http://seednseed.com/admin/fckfiles/file/29501131736.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=mammary+glands+are+a+type+ofPDF 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_off00010263.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10263 16412 bytes
SHA-256: 58d435fa82f5a66a2cfe7e9b6f84b15709ec6c90a5d42b82538b286fcf0884c9
font_01_sfnt_off00012cef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14506 10856 bytes
SHA-256: 3abdfb473223c968ae8bf52720409c082e60930b913cab82cbc490ac85d930d8

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