Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fd4c382520b0b47…

MALICIOUS

PDF

75.7 KB Created: 2021-09-20 19:46:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cce7784b95d589e3560b0d4241184c0c SHA-1: fcd41a8f94d30d99be9672ab784de02a4b82a778 SHA-256: 1fd4c382520b0b47e782220e553f084cb0438fb5bfb85111f420821e193b0a9d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous URLs, many of which are part of link farms hosted on disposable domains or compromised CMS uploads, suggesting an attempt to distribute malware or phish for credentials. The presence of embedded URLs and the overall structure indicate it's likely used as a lure to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://queure.ru/uplcv?utm_term=gta+sa+legacy+apk+download PDF link annotation
    • https://eghamatyab.com/basefile/bainbookcom/files/sovatelizawigosawa.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614048d999799---lepidari.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141a50c4ef62---kidujo.pdfIn PDF document text
    • http://edilgroupdigiovanni.it/userfiles/files/lopurab.pdfIn PDF document text
    • http://inruho.ru/ckfinder/userfiles/files/24198346754.pdfIn PDF document text
    • http://101eyewear.com/luutru/files/wakubolokurikikosedagekex.pdfIn PDF document text
    • http://druckmaschinenservice.com/uploads/fce/files/57494090231.pdfIn PDF document text
    • http://hsaltsj.com/uploads/files/78366813348.pdfIn PDF document text
    • https://calson.garment-pro.com/ckfinder/userfiles/files/jebamigesabidu.pdfIn PDF document text
    • https://canoe.ro/Extras/ckfinder/userfiles/files/sebinafunumabate.pdfIn PDF document text
    • https://retrofitoman.com/ckfinder/userfiles/files/48675930746.pdfIn PDF document text
    • http://dallapietamarchisio.it/userfiles/files/21205457.pdfIn PDF document text
    • http://familiegravesen.dk/userfiles/file/sibipulejedetuguk.pdfIn PDF document text
    • https://073741256.com/uploads/files/202109020519156084.pdfIn PDF document text
    • https://kirbas.com/img/uploaded/file/zomubodeduv.pdfIn PDF document text
    • http://japanbizkorea.com/userData/ebizro_board/file/30065838854.pdfIn PDF document text
    • http://leicesterbiketec.com/userfiles/file/semidozamox.pdfIn PDF document text
    • https://robindayne.com/ckfinder/userfiles/files/36813534417.pdfIn PDF document text
    • http://rubella2.integra-sh.com/userfiles/file/72089785519.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4036e5066---99924224173.pdfIn PDF document text
    • http://levotst.com/uploads/files/4353036093.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143f63ca57c1---62025562390.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_off0000c2fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB0D 17564 bytes
SHA-256: e6bad7aa82ee4e5846919216d7027aa740599c30c0ea95c441c6cb35bd30e71a
font_02_sfnt_off00010892.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10892 10828 bytes
SHA-256: 09ebba85df16da0b5c4ee7ff8427b4b671ea9feb8914323e7d0ccd0110e587a3