Malicious PDF — malware analysis report

Static analysis result for SHA-256 19dc8572fefe7662…

MALICIOUS

PDF

70.3 KB Created: 2021-09-09 19:15:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a47fa24f3c2f1f47a70c8bcc6c3c5020 SHA-1: 34a88d69e53c9115c2442817bffe3baa79d253fd SHA-256: 19dc8572fefe7662545b54953a314ab602c3a31f0c66347136b7203b906475b8
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It functions as a link farm, directing users to numerous external URLs, many hosted on compromised or disposable domains. The primary goal appears to be redirecting users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://oreade-breche.fr/userfiles/file/17907917328.pdf In PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/tajasixufujutevisariz.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/15523919477.pdfIn PDF document text
    • https://dienmayminhchau.vn/uploads/news_file/bewomerinunemejutuzenifap.pdfIn PDF document text
    • http://revize-elektro.info/UserFiles/File/41246581694.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/96aede257f5abf761328d1fe73d28d90/podazebowigusinefitipez.pdfIn PDF document text
    • http://www.julietlandau.com/fckeditor/userfiles/file/56790496575.pdfIn PDF document text
    • http://carrollcountylawyers.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kodumexojutegavoperibiti.pdfIn PDF document text
    • http://ficfart.org/userfiles/file/wovoluna.pdfIn PDF document text
    • https://hyosung-gulf.com/uploads/file/4046564029.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/45317136180.pdfIn PDF document text
    • https://global-product.org/CKEdit/upload/files/76553456063.pdfIn PDF document text
    • http://yevres.fr/ckfinder/userfiles/files/vuwulumepe.pdfIn PDF document text
    • http://h-n-s.net/userfiles/file/fofesomupemoxalibu.pdfIn PDF document text
    • https://zbmbudomont.pl/userfiles/file/vipalenuxaru.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/cb35fbe32475fee099e67a0d3a3dfddd/wososufileziwipejojobogot.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612f03c986436---35736348916.pdfIn PDF document text
    • http://www.electricman.in/demo/frontend/web/uploads/files/jifisibikemalovir.pdfIn PDF document text
    • https://hotelmitrutarija.com/uploaded/files/sojogisabotasawitofodi.pdfIn PDF document text
    • http://freestyler.cz/img/file/namagasixusurarad.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/k7nh2q2222rt115uofmpj3lqd6/37840596719.pdfIn PDF document text
    • http://jyjjapan.jp/files/ckeditor/files/37232482627.pdfIn PDF document text
    • http://ingegneriarossi.it/userfiles/files/59335936471.pdfIn PDF document text
    • http://hodoan.net/userfiles/file/29979388276.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135e8f133464---79039658033.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=google+frp+settings+apkPDF 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_off0000b547.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB547 10664 bytes
SHA-256: 795c601d76104a177a78995a38bc6917a6e762308b1166d8193c2e4edbda1549
font_01_sfnt_off0000cdde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDDE 14824 bytes
SHA-256: fa09c34f1407077f196059cedd6b3647a8728bba8e34a31ad1aa5689135ae5cf
font_02_sfnt_off0000f32b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF32B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1