Malicious PDF — malware analysis report

Static analysis result for SHA-256 f95cc9fd1c3083c5…

MALICIOUS

PDF

85.4 KB Created: 2021-09-19 05:33:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ae3d24989bba15abb7f0b9c40f5bc770 SHA-1: b90d4ae5725ba21566c3d23d9d4858a2dfea41c9 SHA-256: f95cc9fd1c3083c5566ccbad23c21d14a4b049dd3fd00c8f7fa1ed685ca3ca45
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by a machine learning classifier and ClamAV, with the ClamAV signature indicating a phishing trojan. Heuristics reveal the PDF acts as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. The presence of a 'download button' lure further supports a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://allytemp.ru/uplcv?utm_term=honey+and+mumford+questionnaire+online PDF link annotation
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1614036c577aff---18652793054.pdfIn PDF document text
    • http://aiaato.com/FileData/ckfinder/files/20210904_FDF95E998A8F9781.pdfIn PDF document text
    • https://mimpiindah168.com/contents/files/87593218257.pdfIn PDF document text
    • http://15441707.com/data/board/file/20210916002136.pdfIn PDF document text
    • https://vetamblj.si/ckfinder/userfiles/files/67575906553.pdfIn PDF document text
    • https://hondaotohaiphong.vn/upload/files/fesakurinifufuzetagim.pdfIn PDF document text
    • http://automyjka.pl/automyjka.pl/userfiles/file/73741658790.pdfIn PDF document text
    • http://pressvaluation.net/FCKeditor/editor/filemanager/connectors/userfiles/file/fogezitaliguwotazag.pdfIn PDF document text
    • https://weilaimachinery.com/userfiles/files/lawaderojafofupipiwipere.pdfIn PDF document text
    • http://xn--sanitrprofi-p8a.ch/fckeditor/editor/images/file/mawuwonixukavawovixubefep.pdfIn PDF document text
    • http://sous-mama.org/userfiles/file/11637383040.pdfIn PDF document text
    • http://hoitruyengiaocodocvietnam.com/uploads/image/files/basinade.pdfIn PDF document text
    • http://gokea.org/upload/editor/files/kujeduzolojalavujugod.pdfIn PDF document text
    • http://cleangroupbd.com/ck/upload/files/34343125941.pdfIn PDF document text
    • https://renhedc.com/uploads/files/202109011027059007.pdfIn PDF document text
    • https://ayurmitra.com/files/file/48658394909.pdfIn PDF document text
    • https://tavfelugyelet.megujuloenergiapark.hu/admin/ckfinder/userfiles/files/11829005870.pdfIn PDF document text
    • http://kowel.com/ckfinder/userfiles/files/1631361141.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb4a789a2c---92810910184.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132e3f5cf991---dekiridunuvatubumabiw.pdfIn PDF document text
    • https://linhngapt.vn/upload/files/58513878414.pdfIn PDF document text
    • http://mcutech.net/upload/2021/09/file/1631480475491580490.pdfIn PDF document text
    • https://actor-conseil.com/files/file/kovesipakuji.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_off0000d81f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD81F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f031.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF031 16960 bytes
SHA-256: 993483fec2388bf21346c1ebaf4d51d6c68aed468a69bb6dec94ffc18c8ca102
font_02_sfnt_off00011bdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BDD 17192 bytes
SHA-256: cf33155750836c6e0cd2532d70f5c9969a7d2a3ebd9769714497d1b72bec32da

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