Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e5e35d1007f62a8…

MALICIOUS

PDF

75.7 KB Created: 2021-09-08 01:10:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4ce684153fc051b0dd3052a885d149ad SHA-1: 5b9693468ed6961a058e2bcdcfb5bf1040fa3230 SHA-256: 4e5e35d1007f62a8bb05c275745423745a25d6ebdd9d8388110d24acf1105b2d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised CMS upload storage and other disposable hosting, indicative of a link farm. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. The file's structure and URL distribution suggest it's designed to lure users to malicious sites, likely as part of a phishing or SEO poisoning campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://leifs-auto.dk/images/file/molujipaviv.pdf In PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c96ebbff83---jukevojoxebitazozu.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021061820150812.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fddb48df886---68632992898.pdfIn PDF document text
    • http://xn----7sbab1bcaqplb0ccyi9d.xn--p1ai/files/file/46115946282.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c43c51bebac---95872790828.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/378b607e94717320d074c6cd991e4802/zukudurusuj.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/99543166624.pdfIn PDF document text
    • https://locoffice.ru/userfiles/file/74076620886.pdfIn PDF document text
    • https://irepairplus.nl/app/webroot/files/userfiles/files/zalowedavefota.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/98982975993.pdfIn PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/160870ff211a90---sikatebepivokalosejon.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b55cfd539fe---zupajefixonoje.pdfIn PDF document text
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/xiwezutasamupiberitu.pdfIn PDF document text
    • http://kipia-nn.ru/userfiles/file/66151541112.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/d41173208f3108e4504e7698ebd6164b/74041217162.pdfIn PDF document text
    • http://musicpark-live.de/userfiles/file/53948004766.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/df8f9ba61648e3d91fb838b41a26719a/faxesusetew.pdfIn PDF document text
    • http://biplano.eu/userfiles/files/zemozalopubefiwuligakufaf.pdfIn PDF document text
    • http://hsound.ro/images/custom/file/zuluzifofukepexuwusopi.pdfIn PDF document text
    • https://onwater.my/uploads/file/32066514463.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094a7139d200---35125039830.pdfIn PDF document text
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/17557882998.pdfIn PDF document text
    • http://vtaky.sk/media/file/66632611121.pdfIn PDF document text
    • https://ooo-kenk.ru/userfiles/file/4559482720.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/49947718969.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=epub+file+conversion+to+pdfPDF link annotation
    • 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_off0000c480.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC480 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC97 10740 bytes
SHA-256: 80afd0078e44037e460fb76311f7a1fe4582fafd11491291de7d0cb92b71a9c5
font_02_sfnt_off0000f528.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF528 16864 bytes
SHA-256: e058e2fac70dd9f3a7235cf64c1691ffe0e3df2d2c90cc804899275610d0329b

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