Malicious PDF — malware analysis report

Static analysis result for SHA-256 cef6ad3460161f23…

MALICIOUS

PDF

80.7 KB Created: 2021-09-06 03:46:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 27a51f86ca3257574e478e84a363dd62 SHA-1: a9a25b7c490ab9b8e41ce0ead8f67da32dd74ee6 SHA-256: cef6ad3460161f23a2c21d755a0b96157e4d180dc94ded989795715aea18d04f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many pointing to compromised WordPress sites and other PDF files, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure itself is the attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/ce6d2f188143232940b72c4e4247bbbd/14969690857.pdf In PDF document text
    • http://wirtrauenuns.ch/images/file/nijavezesam.pdfIn PDF document text
    • http://bjjiffy.com/upload/55931496162.pdfIn PDF document text
    • https://ksuskalology.com/images/file/tigoxaxakewijebezanod.pdfIn PDF document text
    • http://china-spec.ru/userfiles/file/siworafotirudigawu.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/30164454564.pdfIn PDF document text
    • http://onlineticketreview.com/images/file/30117271852.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/97c3716bd31c2d58dfb9126cd20b6dc4/18692680860.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/ad19990b8a8796e924e2bce9115308ba/jiboxezunuda.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adb4447b55b---pigajetuzunezarokulujuvu.pdfIn PDF document text
    • https://aynadakikemalizm.com/resimler/files/83331470480.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/vkleado9dopi6bpbqd4kim87ud/91743918385.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/19495698696.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16115f483c8363---bomerivafe.pdfIn PDF document text
    • https://cepatdaftargroup2.com/contents//files/watujafopejibose.pdfIn PDF document text
    • http://utopiasacramento.org/clients/0/07/071cdeedc048305be324eb10ab8031d4/File/42945198724.pdfIn PDF document text
    • http://xn-----6kcaheblih5ab0a6afqbzoqe.xn--p1ai/ckfinder/userfiles/files/firiwufufenixexe.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/44d3f49ab0c59403a2cbb20f78ecf0dd/riduxalowe.pdfIn PDF document text
    • http://boekenwinkelindex.nl/images/uploads/kerenujojiredug.pdfIn PDF document text
    • http://www.oomewatersport.nl/upload/files/1258597515.pdfIn PDF document text
    • https://amadesafar.ir/basefile/amadesafarir/files/moxejiwebarurez.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ed9c762bdb9---sezajap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=communicable+diseases+table+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_off0000d6a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A3 17444 bytes
SHA-256: daa8a8ba7bfa44ed6f79cb33523f66338f8a0bc7e43d864870ac50ab3da882ad
font_01_sfnt_off0001041d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1041D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C34 10952 bytes
SHA-256: f1adb1e6a5c9620014c3876d597b9a4f5963cdb32bccb067b2e7be424184a1f1

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