Malicious PDF — malware analysis report

Static analysis result for SHA-256 48ae16a3d7da1213…

MALICIOUS

PDF

82.8 KB Created: 2021-09-18 23:04:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d195c9c86eea5910524b8f271076f1ec SHA-1: 1a47f5841099208623055bb7eb02c0ce8ba9f9ae SHA-256: 48ae16a3d7da1213279d95613d9377ae6b864b67da5e210070f8339839345a55
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, a common tactic for link farms and phishing lures. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://cructi.ru/uplcv?utm_term=bus+simulator+indonesia+offline PDF link annotation
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5c4b6226d---45724678694.pdfIn PDF document text
    • http://preiss.at/upload_files/files/67762411013.pdfIn PDF document text
    • http://crescentcarpets.com/userfiles/file/97719842912.pdfIn PDF document text
    • https://hgb.se/filer/file/nebolimadijokazaw.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/80354559061.pdfIn PDF document text
    • https://birotex.rs/images/files/54838810475.pdfIn PDF document text
    • https://bawauang.com/contents/files/vigunut.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f21eda8f1d---vawimob.pdfIn PDF document text
    • http://thegioichuyendong.info/app/webroot/upload/files/84595612084.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413c83e7d7f---58444916753.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136206fbeb87---maruzefonezerufigegibe.pdfIn PDF document text
    • https://profm.hu/files/file/suwurivisefepukenazug.pdfIn PDF document text
    • http://korsorlampang.net/user_img/files/visorexojebisop.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd4437b8ea---45572405256.pdfIn PDF document text
    • http://omeofest.eu/userfiles/files/pafubijegew.pdfIn PDF document text
    • http://mimarathi.live/assets/ckfinder/core/connector/php/uploads/files/logawakolemorepu.pdfIn PDF document text
    • http://zhjpharm.com/upload/files/deputavuzuwa.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/16612874754.pdfIn PDF document text
    • https://miaousland.fr/ckfinder/userfiles/files/xudikipiduvu.pdfIn PDF document text
    • http://zge-led.com/luodan/images/userfiles/file/petanokixorusemobu.pdfIn PDF document text
    • https://locktactyuma.com/userfiles/file/80798318191.pdfIn PDF document text
    • http://majedalkarkhi.com/pics/file/59073339425.pdfIn PDF document text
    • http://domosplast.hu/files/file/19687611730.pdfIn PDF document text
    • http://patanjali.zohukum.com/ckfinder/userfiles/files/vubuwesozawo.pdfIn PDF document text
    • http://ordineveterinarireggioemilia.it/userfiles/files/femaniw.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_off0000de57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE57 17564 bytes
SHA-256: 2254fdffa755a1bc6d24d333259fb058332914c77579cfc0b2bf9131ca9842a2
font_01_sfnt_off00010c73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001248a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1248A 10668 bytes
SHA-256: ef90f4a9755f8d4c9d5b2f06479be5c72d4814e62e82a98afe2afb80d8691dcd

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