Malicious PDF — malware analysis report

Static analysis result for SHA-256 8be501c4b5db2a49…

MALICIOUS

PDF

75.7 KB Created: 2021-09-16 23:01:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ac685e7031cebb8db437ddfd38831229 SHA-1: e25461ae247dcaf83b7235d4384e39e529964913 SHA-256: 8be501c4b5db2a49ef436eab4b39d4d6ccca7a980003dd27452808036af743e0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://chcial.ru/uplcv?utm_term=limbo+apk+full+cracked PDF link annotation
    • http://zpb-maciejewski.pl/upload/fck/file/sevosalivesugofififezifu.pdfIn PDF document text
    • http://stattus.com/assets/file/41279429904.pdfIn PDF document text
    • https://xn--interpeas-r6a.es/upload/files/75033307816.pdfIn PDF document text
    • https://travellifeafrica.com/ci/userfiles/files/68803643914.pdfIn PDF document text
    • http://perseverance.cyou/updatefiles/file/31781544535.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613f6cdb37a5d---botetotutosudivijopojo.pdfIn PDF document text
    • http://betonkeritesek.eu/Content/files/vaduruda.pdfIn PDF document text
    • http://thietbiytedaibao.com/media/files/beganepisuvukujuxosufuga.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613558779c6aa---najaw.pdfIn PDF document text
    • http://mikailang.com/userfiles/file/20210912031902_39975118.pdfIn PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/jomiwogiziji.pdfIn PDF document text
    • https://hobbyschuurtje-webwinkel.be/images/userfiles/file/44067408278.pdfIn PDF document text
    • http://ambartakip.net/belgeler/file/duxojetagibesanube.pdfIn PDF document text
    • https://ceccarmaramures.ro/userfiles/file/48123093495.pdfIn PDF document text
    • http://iwilldoit.ru/uploads/files/files/kibebixaguji.pdfIn PDF document text
    • http://xlpe.net/Images_upload/files/xeziwuve.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/xovubakurokitesose.pdfIn PDF document text
    • https://egc.ecrom.work/syo/files/14050504162.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1613612d4e1328---bitasawufefofazuz.pdfIn PDF document text
    • https://eastmangroup.org/ckfinder/userfiles/files/53434408590.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16140b99e1b567---48116436112.pdfIn PDF document text
    • http://farmaciafici.com/userfiles/files/sanunu.pdfIn PDF document text
    • https://nitdgp.ac.in/uploads/userfiles/files/xofusipojejukuzotolenu.pdfIn PDF document text
    • http://tatagz.com/uploadfile/files/juren.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133e7440a845---rumutejifidupikukusu.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_off0000c655.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC655 16788 bytes
SHA-256: 6a392a9cda278afc20be1b745f65dfe15bbac7fedb099e56fb073375304a2452
font_01_sfnt_off0000f117.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF117 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001092e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1092E 10700 bytes
SHA-256: bba96909a579f4c25374ff95deb0fa0d4ff7965680f4fd9fbf4be24d36030347

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