Malicious PDF — malware analysis report

Static analysis result for SHA-256 a552818611deb3b5…

MALICIOUS

PDF

73.5 KB Created: 2021-09-28 02:00:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 625356b4d3b4aed388ad7dad5e5f15f2 SHA-1: 027d5b09ce1f064605c678b4400d134cf9e4ee61 SHA-256: a552818611deb3b509dffb7643e3a37f24899bc4f1e9b7015b1769a9e6a8580a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and ClamAV as malicious, indicating it is likely a phishing or malware distribution document. The presence of numerous external URIs, many hosted on compromised CMS uploads or disposable hosting, suggests a link farm designed to redirect users to malicious sites. The ML classifier output of 0.994672 further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://ketchas.ru/uplcv?utm_term=fifty+shades+of+grey+movie+free+watch PDF link annotation
    • https://kuzeyilac.com/resimler/files/18862768241.pdfIn PDF document text
    • http://equipociclistaugeraga.com/ciclistas/userfiles/file/juboxemewinaf.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/161402e86a9c73---sifuxipu.pdfIn PDF document text
    • http://poetische-malerei.de/web/editor/files/ludofaz.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b053daa44f---74129635876.pdfIn PDF document text
    • http://hairtransplantmangalore.com/uploaded_files/userfiles/files/satefex.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/6l4b9v5k5hausajadaf9grm6i7/depesolad.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147ef4c21227---84925496250.pdfIn PDF document text
    • http://navigator-nsk.ru/userfiles/file/feloru.pdfIn PDF document text
    • http://zussobrance.sk/grafika/dokumenty/viwakovuwozazakizuzes.pdfIn PDF document text
    • https://olamare.com/img/uploaded/file/kefojafaduduzomilujoja.pdfIn PDF document text
    • http://vaithun.net/upload/files/wadixorar.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/98ca54c8e2911dc55c6a2608b3480cbe/zovepulawe.pdfIn PDF document text
    • http://chamdure.com/DATA/files/60424090317.pdfIn PDF document text
    • https://knurussian.kr/DATA/upload/files/202109200105545025.pdfIn PDF document text
    • http://insuralead.com/userfiles/file/gemolog.pdfIn PDF document text
    • http://art-ball.net/files/file/7776163439.pdfIn PDF document text
    • http://ksklinika.ru/ckfinder/userfiles/files/85633502958.pdfIn PDF document text
    • http://extrastyle.ee/ckfinder/userfiles/files/45633393511.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/sixola.pdfIn PDF document text
    • http://malabarisproducoes.com/arquivos/files/59149121193.pdfIn PDF document text
    • http://hangtatmj.com/userfiles/tadokamunovugixigenibusa.pdfIn PDF document text
    • https://www.padanguparduotuve.lt/ckfinder/userfiles/files/gedijepe.pdfIn PDF document text
    • https://ubk-sad.de/azubi/userfiles/files/68223363709.pdfIn PDF document text
    • http://canoto.us/Images_upload/files/mulevun.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_off0000b5bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5BD 11016 bytes
SHA-256: 2ed609ad51acbd3d800ad813d995712dd308b526abcd8e723749e3999c44d5ea
font_01_sfnt_off0000cf3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF3B 18780 bytes
SHA-256: a47eb8f87fb217122273786456c51b063d13e7d9df3653c5d73e08540a8e6391
font_02_sfnt_off00010044.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10044 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.