Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a997696bdcd624e…

MALICIOUS

PDF

76.5 KB Created: 2021-08-28 04:11:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 24bef0cac00256f679ef19e5209e0824 SHA-1: b8bc74baab08f21bbb8a17b074e88748acae83a8 SHA-256: 8a997696bdcd624ea7e79864082cda471baad4e45a0583402aa63d94f44ed54c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various websites, many of which appear to be compromised WordPress installations used for hosting malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of external URIs and link farms suggests an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://oniceh.ru/uplcv?utm_term=mr+and+mrs+iyer+watch+online PDF link annotation
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/658aa70ad7762e4d0a420b8613a728db/41450071344.pdfIn PDF document text
    • http://derma-dts.de/files/file/fezozuwategifus.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16090bb912348a---17466270553.pdfIn PDF document text
    • http://prvugkh.ru/uploads/files/51112008298.pdfIn PDF document text
    • https://eastmanllc.com/ckfinder/userfiles/files/sexat.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/ias96vdd760c627s72fum3r6i8/bafakafuvibisevagefomigeb.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607238b980661---samobusutarigakonubu.pdfIn PDF document text
    • https://digidatadecolombia.com/wp-content/plugins/super-forms/uploads/php/files/13915296c9fe1b7ad0cc81665119d802/51088346977.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/mumogokimolaligafusukapi.pdfIn PDF document text
    • http://vodova51-53.cz/files/39673034552.pdfIn PDF document text
    • https://mudraconsultancy.com/uploads/files/towaribakekifiw.pdfIn PDF document text
    • http://geometrabottero.it/userfiles/files/gewekogigogawibipiripuna.pdfIn PDF document text
    • http://canhtoanland.com/upload/files/mogis.pdfIn PDF document text
    • https://valubil.com/public/uploads/cms_file/cms_files/padepig.pdfIn PDF document text
    • https://valubil.com/public/uploads/cms_file/cms_files/xutuxarumafuwadofamunap.pdfIn PDF document text
    • https://tiklatakip.com/calisma2/files/uploads/48287670482.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160714293b1193---sevomudizitagekujati.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/9cf40ab1cfe3b19cbd46990656ca5628/pabesopewuzenoribixiserut.pdfIn PDF document text
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/7e4200626cacf8b8d03b61e271193bde/zovisofokobikajanegogaxur.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/43181104783.pdfIn PDF document text
    • https://chambres-hotes-aube-bleue.fr/userfiles/file/6819028004.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/7vgv5eeftmsc222op6i1ofvhb0/wizipiruwekanejazifimug.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160936a7977b34---74253519112.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608af94476564---dakubelezul.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/bogavafe.pdfIn PDF document text
    • 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_off0000c647.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC647 10828 bytes
SHA-256: b659f941452f5ef77d0c232090186b1c546de6975e8092022aef6c8505a3fbcd
font_01_sfnt_off0000df17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF17 17016 bytes
SHA-256: 7685526bc2b6c5cb3f8f6f97e73112dc92448c3b033a67e19aee149b28c42d16
font_02_sfnt_off00010aef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1