Malicious PDF — malware analysis report

Static analysis result for SHA-256 aebab1c9ba003fbc…

MALICIOUS

PDF

76.6 KB Created: 2021-09-18 01:36:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 72f271e622c9245f23606f33ae0a797b SHA-1: f3fa588fd249624775e0947a346be69c99c70c9a SHA-256: aebab1c9ba003fbccfd7008a7548861f5b156242f99beb3df90d8ef00d2fae80
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous embedded links, many pointing to disposable hosting or compromised CMS upload directories, indicative of a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

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 http://holidayservicemarsala.it/userfiles/files/jawigerezab.pdf In PDF document text
    • https://oasis-travel.ro/files/36234939427.pdfIn PDF document text
    • https://rux-thai.com/ckfinder/userfiles/files/37190918421.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/nagigojozumu.pdfIn PDF document text
    • https://cfi-registration.org/buzzboxgift/img/userfiles/files/nugubelunusalomi.pdfIn PDF document text
    • http://razzledazzleevents.in/userfiles/file/12683940710.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16144b7ae00a74---69044417274.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/funopodasixurezubuxatin.pdfIn PDF document text
    • https://doktor-ara.com/userfiles/files/bawasujed.pdfIn PDF document text
    • http://bandbaajabarat.com/ci/userfiles/files/nuluwidokiguruf.pdfIn PDF document text
    • https://alharithiforcameras.com/ckfinder/userfiles/files/36716806947.pdfIn PDF document text
    • http://lnshiyue.com/userfiles/file/20210906174626_1725949564.pdfIn PDF document text
    • http://www.fishandcosolicitors.com/uploads/files/74227066840.pdfIn PDF document text
    • http://voijin.com/userfiles/files/babori.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613d9da4847cc---48976083682.pdfIn PDF document text
    • http://gilendor.cz/userfiles/file/42293799964.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/k4ppmhbuds96mdtl5bvq0c88t4/kagiwudemikajej.pdfIn PDF document text
    • http://bukharaalpharetta.com/sites/default/files/file/wifumesezegofu.pdfIn PDF document text
    • https://egokituz.org/files/galeria/files/17268620101.pdfIn PDF document text
    • http://www.mmalappeenranta.com/tiedostot/files/47877542077.pdfIn PDF document text
    • http://luxlustry.ru/img/upload/3360506012.pdfIn PDF document text
    • https://samsungvrvklima.com/upload/ckfinder/files/67553853051.pdfIn PDF document text
    • http://freetourscadiz.com/ckfinder/userfiles/files/muvokazowuxebawin.pdfIn PDF document text
    • http://ilonew.tasksplan.com/ckfinder/userfiles/files/58207173030.pdfIn PDF document text
    • http://ukonlinedirect.com/userfiles/files/mowafizepaw.pdfIn PDF document text
    • https://assignmentmart.com/ckfinder/userfiles/files/10932736173.pdfIn PDF document text
    • https://khogiaydantuonghanquoc.com/images/news/file/7001115786.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=crash+report+in+androidPDF 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_off0000c906.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC906 10476 bytes
SHA-256: 4fa5bd9c1429de3cbc5526041bb30d4db66702d8bec65836b5bdcf058607c3ed
font_01_sfnt_off0000e0c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f8d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D3 16644 bytes
SHA-256: 61dac1a7fd3d1908cb4cfb7dc6aa730abecd6cafc0b8d023cf67271b37937d14