Malicious PDF — malware analysis report

Static analysis result for SHA-256 3185f254759d0b90…

MALICIOUS

PDF

82.2 KB Created: 2021-09-14 18:07:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 56b980923e649ee18ee0dfc6dbd26946 SHA-1: 756c09862e1ec09c63e170df4933f006150e6811 SHA-256: 3185f254759d0b90e5a3641345f54c6e9e647358a3522883e5e5b915824faae4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or are part of a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to external sites for exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://singhaniabrothersltd.com/ckeditor/ckfinder/userfiles/files/jowijojuzitilejasexiveke.pdf In PDF document text
    • https://total-sport.pl/img/upload/files/dupifizimukavatu.pdfIn PDF document text
    • http://livelyway.com/ckfinder/userfiles/files/maboravija.pdfIn PDF document text
    • http://f-kcc.jp/user_data/userfiles/files/rometafirijo.pdfIn PDF document text
    • https://foundationkuzmanov.com/files/39730571303.pdfIn PDF document text
    • https://artistprasanna.com/userfiles/file/94687212380.pdfIn PDF document text
    • http://dagmar-e.de/userfiles/file/rumavakemumidepadomiremo.pdfIn PDF document text
    • http://nedvizhimost-v-sharm-el-sheikhe.ru/uploads/files/xefadabetuvagazilugaxaru.pdfIn PDF document text
    • https://autopits-directo.migrupoq.com/ckfinder/userfiles/files/zasuxukirib.pdfIn PDF document text
    • http://netcentricnj.com/ckfinder/userfiles/files/tafutikirudun.pdfIn PDF document text
    • http://scbczy.cn/up_files/file/20210911_130543.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1613d58575c2c0---34040584801.pdfIn PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/fidimumedipelumepovi.pdfIn PDF document text
    • http://chromowane.com/userfiles/file/83058959842.pdfIn PDF document text
    • http://cecev.com/stockages/files/nixuv.pdfIn PDF document text
    • http://mutamobilya.com/images_upload/files/rivunatuviwemiguzu.pdfIn PDF document text
    • http://reklama-v-sochi.com/ckfinder/userfiles/files/76580734404.pdfIn PDF document text
    • http://metallpress.info/files/kuwanomafadet.pdfIn PDF document text
    • http://huzatfokozo.hu/editor_up/gekuzavalalofo.pdfIn PDF document text
    • http://corporatiegids.nl/uploads/files/nuxijutazezakivopimesap.pdfIn PDF document text
    • https://duproject.com/uploadEditor/files/lopudulibedew.pdfIn PDF document text
    • https://free-spirit-city.eu/uploads/wysiwyg/files/pezevuzovuro.pdfIn PDF document text
    • https://webbsoil.com/home/webb/public_html/ckfinder/userfiles/files/49740044572.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/072d2e237315bdaddbb4842615bad828/zutofakarimejakitiw.pdfIn PDF document text
    • https://sergiomauri.com/images/file/28555512143.pdfIn PDF document text
    • http://ladyvenus.it/userfiles/files/junox.pdfIn PDF document text
    • http://abwcockeysville.com/uploads/files/60246538231.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161407d19b0d76---8966317446.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=samsung+galaxy+s5360+appsPDF 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_off0000da68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA68 18160 bytes
SHA-256: c45d70bc0dfb15c288623313b0d9f107197d8352d1dfaaa1de9f049f5de973a3
font_01_sfnt_off00010966.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10966 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001217d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1217D 11040 bytes
SHA-256: cc516f515d57aeb4870f36d4d8f5d3903e921b6647f97f1f80e9ceca42ef6ed2