Malicious PDF — malware analysis report

Static analysis result for SHA-256 1457160946b85c5a…

MALICIOUS

PDF

78.6 KB Created: 2021-09-14 20:13:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ef172d46a4c35862fe5b78e354db0417 SHA-1: d9e83e89ac7409d7f49053b963a6de1e0ba1ec3b SHA-256: 1457160946b85c5a5b62daa05a68b767904553562b57a3523c388f26b102a790
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a link farm pointing to various websites, some of which are hosted on compromised CMS platforms, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the nature of the heuristics strongly suggest the file is intended to redirect users to malicious sites, likely for phishing or to download further payloads.

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://pixomot.ru/uplcv?utm_term=bad+ice+cream+3+unblocked PDF link annotation
    • https://perfecthospitals.com/ckfinder/userfiles/files/63595343301.pdfIn PDF document text
    • http://drzwiukryte.pl/userfiles/file/xapofup.pdfIn PDF document text
    • https://mptradingcompany.com/userfiles/file/pojopisepoxejumotenof.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/50232393568.pdfIn PDF document text
    • https://gogreenonline.net/userfiles/image/fckeditor/file/47427893350.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5d0f424f3---wajesalosidelanaxer.pdfIn PDF document text
    • https://www.bosingels.nl/ckfinder/userfiles/files/1195266962.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/63539357799.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac504b744b---7502363360.pdfIn PDF document text
    • http://goldmustang.ru/files/files/7478733750.pdfIn PDF document text
    • https://alummaswaja.com/yii/sdbalikpapan/home/images/upload/files/17345953290.pdfIn PDF document text
    • http://nutranghongngoc.com/media/ftp/file/vubata.pdfIn PDF document text
    • https://chuyennhakienvangvn.net/upload/files/xifudaguroweniginuresew.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/161356fa810753.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613920adb6390---jileja.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/jazetazigurunojuv.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/kubaxezozesuradivoviwo.pdfIn PDF document text
    • http://nyitotthetvege.kastelyszallodak.hu/userfiles/files/61362596867.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/210903150600750787dg271g.pdfIn PDF document text
    • http://fk-fudosan.1nino3.com/app/webroot/img/userfiles/files/43285474911.pdfIn PDF document text
    • http://tomgiongvip.com/uploads/files/file/82108475174.pdfIn PDF document text
    • http://abworder.com/uploads/files/63136299277.pdfIn PDF document text
    • http://ruihuitax.com/files/file/fisumirowinodomujuvowolo.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_off0000cf3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e756.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE756 10820 bytes
SHA-256: 9ceac40589a283103055c75f156384a5f59be2333cb836e6f037b36d1ca9f595
font_02_sfnt_off0001003a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1003A 17332 bytes
SHA-256: 640e2257a46101118692ffbfea281427aba9040f13784ed5ab39ceb3a319d91e