Malicious PDF — malware analysis report

Static analysis result for SHA-256 feac41c5d7fee078…

MALICIOUS

PDF

81.1 KB Created: 2021-09-19 03:14:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6a099836ae5f79cce2e95fc38339ac3c SHA-1: bad8fe958e3bbf248d73cdfd3972bfa3b331706a SHA-256: feac41c5d7fee078deacebe3005a8ea21ae30e644b3d62e8c773062c3222b9c0
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs that point to various domains, many of which appear to be disposable hosting or compromised CMS upload storage. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is a link farm on disposable hosting, and the presence of 'utm_term' parameters suggests a phishing or SEO manipulation attempt. The primary goal appears to be directing users to potentially malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://irlanc.ru/uplcv?utm_term=mx+player+mp3+song+download PDF link annotation
    • https://www.aledrukujemy.pl/ckfinder/userfiles/files/82338700611.pdfIn PDF document text
    • http://haiannweb.com/uploads/files/bidolaxiveledupubavo.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/pinenafoni.pdfIn PDF document text
    • http://solyaris.pro/admin/ckfinder/userfiles/files/10108120725.pdfIn PDF document text
    • http://maroba-zirndorf.de/file/51553628541.pdfIn PDF document text
    • http://xn----7sbicwad4afgcgd5aph7d5e.xn--p1ai/ckfinder/userfiles/files/73367974058.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3d2a06bfa---14415765161.pdfIn PDF document text
    • https://waelfawzy.com/userfiles/file/In PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612edd4712633---7923604309.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/c654186865c4ca4488c3d64c7fb95caf/fopejorojudupodukuna.pdfIn PDF document text
    • http://mediedil.eu/userfiles/files/tunifudofilaboxokewuligo.pdfIn PDF document text
    • http://k-sta.kr/FileData/ckfinder/files/20210917_DF9BCD4DA9D4CDEF.pdfIn PDF document text
    • http://domkomplekt34.ru/attachments/file/vejazifuwatofi.pdfIn PDF document text
    • https://proia.bg/userfiles/file/xovakoxa.pdfIn PDF document text
    • https://joebalogh.ro/imagini_ws/wobifubudikasigijidufiluz.pdfIn PDF document text
    • https://vvpta-irvine.org/userfiles/file/janajipasesamojevopileguw.pdfIn PDF document text
    • http://sooclose.eu/upload/File/fopuvu.pdfIn PDF document text
    • http://kleni.cz/userfiles/file/93384345334.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16136dc21b3a54---21434283110.pdfIn PDF document text
    • http://korean-school.hu/hangul/userfiles/file/joxizibimenazeja.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/36486684290.pdfIn PDF document text
    • http://prestinoequitacion.com/imagenes/upload/files/922704425.pdfIn PDF document text
    • https://carolinevlieghe.fr/images/file/40400920555.pdfIn PDF document text
    • http://vlajamo.cz/images/file/11036878047.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_off0000d8ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8EF 11012 bytes
SHA-256: 01f1954926c3a16ea38cbbdae707a111dd603c1a7e26eac08a9c80fc6334d7b0
font_01_sfnt_off0000f270.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF270 16912 bytes
SHA-256: fee4684310a985e8980cbf2b5300be79b90c67129845dc623ce64061affbb839
font_02_sfnt_off00011e8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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