Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a48ce76da306cb3…

MALICIOUS

PDF

79.9 KB Created: 2021-09-14 05:57:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9969072b2bd4763545da5d0a84281df3 SHA-1: 0c96863b16623cd08bfea5d01253c9f7aecd4e3d SHA-256: 6a48ce76da306cb34fd3d4813cc8f7c2560dd6404fcc760ceb5495c7cec83e69
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of a link farm pointing to compromised CMS upload storage and disposable hosting, combined with a 'download' lure, suggests a phishing or malware distribution scheme. Although no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a social engineering attack aimed at tricking users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://implantologie-deva.ro/app/webroot/files/userfiles/files/gokozotowiburafukafusu.pdf In PDF document text
    • https://vinadesigndanang.vn/uploads/image/files/28162460617.pdfIn PDF document text
    • http://donleroy.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/54000413916.pdfIn PDF document text
    • https://zhansq.cn/upload/file/28812238757.pdfIn PDF document text
    • http://ehomerealestate.org/images/file/57870724802.pdfIn PDF document text
    • http://showplus.ae/userfiles/files/gisagiguzofob.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613661eb8dcc5---bozofukivakivikuso.pdfIn PDF document text
    • http://slsnn.ru/content/file/64431416222.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/72ad191781296b2cf25dd00623749a2b/44307205115.pdfIn PDF document text
    • http://tikatalog.sk/_files/file/39807318280.pdfIn PDF document text
    • http://whitedwarf.ru/public/images/ckfinder/files/tipanaxiwolegalivafal.pdfIn PDF document text
    • http://dainichiji.com/upload_ckr/files/6098669509.pdfIn PDF document text
    • http://www.gleason.com.au/application/third_party/ckfinder/userfiles/files/17543936930.pdfIn PDF document text
    • http://olimpic.hu/ckfinder/userfiles/files/xubibupugenerovidu.pdfIn PDF document text
    • http://pspectr.ru/userfiles/file/78829177630.pdfIn PDF document text
    • https://factorysales.com/userfiles/files/tivilenuvanar.pdfIn PDF document text
    • http://daydreamspin.com/userfiles/file/zavosiworeja.pdfIn PDF document text
    • http://ajej.pretty-match.com/upload/files/41305569994.pdfIn PDF document text
    • http://stimatacasa.eu/userfiles/files/pomesi.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613136430c2d6---8335122065.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f6a5bc5bfc---42808657948.pdfIn PDF document text
    • https://lose-weight.tw/upload/files/65379876715.pdfIn PDF document text
    • https://delcinfo.ru/img/files/files/nunidulinetumexigewax.pdfIn PDF document text
    • http://issaproject.com/app/views/panel/ckfinder/userfiles/files/bagafukezogodagegokor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=ppt+to+video+converter+free+downloadPDF 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_off0000d605.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD605 10596 bytes
SHA-256: 0b362d678a85bb16e262312e5dadddef2d8e48a2554df175e71feaf972ce47e2
font_01_sfnt_off0000ee63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010675.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10675 16756 bytes
SHA-256: ac625a2dd73dfed84e9ec8d20c4e83aa509329e7a2a885d38d49c2a0b981fb61

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