Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb1d814f9549d28b…

MALICIOUS

PDF

71.8 KB Created: 2021-09-07 16:08:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d86bfdfc4c51248dcb8af43dfc24dbd7 SHA-1: b1ccb0dbdd38c393e3e1db0927487aa14b6edcb1 SHA-256: bb1d814f9549d28b1c67bbcf8b0834923a235c849bd254866354b14e055ac9a5
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous URLs pointing to compromised websites and disposable hosting, indicating it functions as a link farm. The primary purpose appears to be directing users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://smidgel.ru/uplcv?utm_term=section+12.1+what+is+stoichiometry+worksheet+answers PDF link annotation
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100420eb6add---naredexuxujul.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/pqj447tuc37u4a562mk4bjgq5p/jafixuvasegidawelugi.pdfIn PDF document text
    • https://essaidafm.com/uploads/FCK_files/file/9586187440.pdfIn PDF document text
    • https://impactcleaningserviceskc.com/wp-content/plugins/super-forms/uploads/php/files/0549aba21928605ce63b269bf5691816/8400176160.pdfIn PDF document text
    • https://cr2tek.com/userfiles/Proj_Name//files/6333638767.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/f6dbe6be26833ac1db883cad1cac9af7/pafajoxurizowavibug.pdfIn PDF document text
    • https://aczv.fr/userfiles/file/gafapujazasipinoku.pdfIn PDF document text
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/lorilemilujuvugeriwe.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/k1vr2i4cu1efmae7qmsk5qsrs7/61266838574.pdfIn PDF document text
    • https://ibericadearmerias.com/file/27822013265.pdfIn PDF document text
    • https://norservis.cz/files/files/tusulet.pdfIn PDF document text
    • http://ogledalata.bg/uploads/pages/files/38773159665.pdfIn PDF document text
    • http://sllight.ru/design/img/upload/file/62166770472.pdfIn PDF document text
    • http://zzquansu.cn/d/files/40811573233.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/f7acsvn4u5tvvsjttv9i7rgeuu/lekesabedarozarudetoz.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/34aa75ca79c479fb2b39b66b712428b0/kabizujud.pdfIn PDF document text
    • http://gyndoktors.de/ckfinder/userfiles/files/43634671717.pdfIn PDF document text
    • http://dynamic1984.com/user_file/file/kusuvaruzug.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/u8v9mp3kj8c16g9fk8vfg8ije5/74134224819.pdfIn PDF document text
    • http://urgentcarepb.net/userfiles/file/16734442483.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/tukutejefisabetunegiwumo.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4e936a27a---mexaneturemolifowe.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/69177467232.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_off0000b71b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB71B 15692 bytes
SHA-256: 1b51d1be3cb69cbac9451a0e320e40974b832fea822db6570b6c91dc9b607456
font_01_sfnt_off0000df21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF21 11056 bytes
SHA-256: 0ce12a57f771a800ddab5a02f6f4a95e846a1f326d4637fd488dd0de922f4e57
font_02_sfnt_off0000f8d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1