Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9e8119b57642234…

MALICIOUS

PDF

82.5 KB Created: 2021-09-13 06:12:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e39a92080123fe387e7ee8edf3f72c17 SHA-1: 97b6b03d0b57ef9b607baf85b91fa73b4d35e4a3 SHA-256: c9e8119b5764223467ada35a244db82f4f8f548bf66880f2bbe53fbf6176f325
224 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains embedded JavaScript and a large number of links, many pointing to compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution campaign. The primary attack pattern involves directing users to external URLs, likely to download further malicious content or steal credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 9

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crewmak.ru/uplcv?utm_term=how+to+transfer+contacts+from+one+android+phone+to+another PDF link annotation
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/m99cmfnkknbhppkn26faqak231/77608718192.pdfIn PDF document text
    • http://zpkprzemysl.pl/ckfinder/userfiles/files/tojitojago.pdfIn PDF document text
    • http://sccsfz.org/upload/2021-09/76570755994.pdfIn PDF document text
    • https://ruxthai-guesthouse-chiangmai.com/ckfinder/userfiles/files/79208820810.pdfIn PDF document text
    • http://www.mmd.ntou.edu.tw/ckfinder/userfiles/files/93070093390.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/d1d4dc730995d0a4926c4135194eccf2/rijidakatibakigiperuveba.pdfIn PDF document text
    • http://shiinamotors.com/js/upload/files/kanutepisovorolufulomadev.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613000c1c6f7a---rolusafelemigoras.pdfIn PDF document text
    • https://i-try.tw/upfile/files/2021/09/13/82368968444.pdfIn PDF document text
    • http://americansemitruckparts.com/d/files/43620385815.pdfIn PDF document text
    • https://vkgnassociates.com/dayafter/uploadimages/newsimages/file/zukov.pdfIn PDF document text
    • https://hefcom-hydraulics.com/ckfinder/userfiles/files/fukafopaxipoz.pdfIn PDF document text
    • https://sukienmiennam.com/userupload/files/vamaxuduturopesudiri.pdfIn PDF document text
    • https://karolinanowak.com/userfiles/file/naliluwunudivipebuzizumer.pdfIn PDF document text
    • http://lpc2529.com/piceditor/file/nifagizekijazixuxuz.pdfIn PDF document text
    • http://myphamnanyno.com/luutru/files/majesafijatolo.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dd0f1025b1---12933446515.pdfIn PDF document text
    • https://j26clean.com/upload/files/35244087224.pdfIn PDF document text
    • https://vresponse.net/userfiles/file/tepovajumogamamavijuniwef.pdfIn PDF document text
    • http://clinicaveterinariasangiacomo.it/userfiles/files/wunikatarazezalogisudus.pdfIn PDF document text
    • http://vcelari.naceradec.cz/includes/ckfinder/userfiles/files/48700447956.pdfIn PDF document text
    • https://benmoonpharma.com/userfiles/file/95703649282.pdfIn PDF document text
    • http://xpeedon.net/userfiles/file/20210908055945.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/d9197cf98ab65a2fd7d78e818c5b5310/mugirep.pdfIn PDF document text
    • http://www.bash.cl/media/file/24865350620.pdfIn PDF document text
    • https://groupunsur3.com/contents/files/gasokatufunakupevasekebef.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_off0000dd15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f527.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF527 17220 bytes
SHA-256: c2ab5307f25bccd974fff894e7e1eed0c9e364e7af3e2608ad95c29e2a944246
font_02_sfnt_off00012249.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12249 10916 bytes
SHA-256: 375fcd1656a7e077188ad3f69b253632a8140f992417f91619457da0c840e009

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