Malicious PDF — malware analysis report

Static analysis result for SHA-256 abc5ba362fe4388a…

MALICIOUS

PDF

86.1 KB Created: 2021-08-27 12:53:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 33e3f5e586fd5cf0d8f4203681134da0 SHA-1: 5890c681dd1a9eb2f2d84a5276a89b911cb8f180 SHA-256: abc5ba362fe4388ae82ef66f4a4be197f88cfccfef6e03ff31cab78eb757c5e7
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, and the document body was unreadable, but the heuristic findings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/057abf8c5bff8995a48bf461493cccb0/risozujijemodeso.pdf In PDF document text
    • https://danielstrehlau.com/userfiles/file/64760964630.pdfIn PDF document text
    • http://xn--h49avwqct32ewe967crscpsaz7d.com/ckupload/files/57331949386.pdfIn PDF document text
    • https://www.spitalmoldovanoua.ro/ckfinder/userfiles/files/kalifozana.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1611680a19f297---burerobenaxawe.pdfIn PDF document text
    • http://tasarimak.com/ckfinder/userfiles/files/gowiluxufetezo.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607983ce31f51---kudedu.pdfIn PDF document text
    • https://gencshoworganizasyon.com/upload/ckfinder/files/gosadigepiri.pdfIn PDF document text
    • http://abwva.com/uploads/files/46239480640.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/31a4dbca7402f608e3375edb16ce3699/6658989233.pdfIn PDF document text
    • http://twothirdsmajority.us/clients/38522/File/juzelaba.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ad26b0c8dcc31b3a754d2b731d743c6f/gimuvibowisan.pdfIn PDF document text
    • http://macierz-grodziec.org/files/file/jududepatixamijo.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/94120701600.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/faretetuvifusakaju.pdfIn PDF document text
    • https://angkaganjil.com/contents//files/4597020258.pdfIn PDF document text
    • https://www.parquesanalbertohurtado.cl/ckfinder/userfiles/files/79348484522.pdfIn PDF document text
    • https://texigo.tw/upfile/files/2021/06/22/lalugas.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/16076e3efba8a4---13465615759.pdfIn PDF document text
    • http://maybaobidinhdinh.com/upload/files/kalaneloxadudosux.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160ce083d643af---92487263762.pdfIn PDF document text
    • http://fujiya-la.com/uploads/files/30954142560.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088888dce1a3---83204854749.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b16d86a1f36---84536596420.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+find+a+slope+and+y+intercept+of+an+equationPDF 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_off0000ebca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBCA 11052 bytes
SHA-256: 80efa5fbf8c74e4daa97a7985463fd30937c93286c7d74e98d7b2b6fb3fce3aa
font_01_sfnt_off00010578.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10578 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D8A 16704 bytes
SHA-256: 13b900f64d78dcc94d4e6c80d65189a52aba0ae00f4d942cce80860354ce1662