Malicious PDF — malware analysis report

Static analysis result for SHA-256 28d40e9f88ed146f…

MALICIOUS

PDF

80.7 KB Created: 2021-08-19 04:01:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 8e450aae971d791ad3a000ff4d09dcfe SHA-1: 7bbb3edc0227b284b84ebb0cf308d578ecdbad7e SHA-256: 28d40e9f88ed146fa4d8a5c6555111e6d1527506abc56f3b923516d07ee00854
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded URLs, many of which point to websites hosted on compromised CMS platforms. The ML classifier and ClamAV both flagged this file as malicious, indicating a phishing or trojan distribution attempt. The primary function appears to be acting as a link farm to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 http://batiment-tunisie.com/userfiles/file/41145592282.pdf In PDF document text
    • https://fourseasons.events/wp-content/plugins/super-forms/uploads/php/files/5b775cc13741ac46ea6c850f33cfefe3/kasujamil.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4f575d74f---57319897281.pdfIn PDF document text
    • https://encoregallery.us/wp-content/plugins/super-forms/uploads/php/files/393335fdd0a652801f7251c8c3c9ed93/48661496955.pdfIn PDF document text
    • http://wellnesszeewolde.nl/site/data/ws/files/14654886055.pdfIn PDF document text
    • http://garmagostaran.com/Upload/file/podinem.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/e152215a89f68c80edc7509ea344f0d8/gisona.pdfIn PDF document text
    • http://gps-tw.com/CKEdit/upload/files/99422010574.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c7e8e4d265---4143832536.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/bffe3d61015e04e8d2f06bd3dbe254d7/vaxepukibem.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160bbaa82ce713---pesaxirofudebuxetak.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/79002889205.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210709144217.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/7df39a009b9b9d7a86f644e533c56cf3/sokadimojud.pdfIn PDF document text
    • https://opsclown.it/ckfinder/userfiles/files/24694844013.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/5ca560de5c6abf7b08c6026b0651faa6/63605522480.pdfIn PDF document text
    • http://chetaomaynganhnhua.com/uploads/files/19224596934.pdfIn PDF document text
    • https://aonetreks.com/uploads/file/bupafapugusamen.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/57653915313.pdfIn PDF document text
    • http://xn----8sbemnkjd7bfu.xn--p1ai/design/img/upload/file/99347572863.pdfIn PDF document text
    • https://principesgs.com/userfiles/file/pobedezototoja.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=anti+theft+alarm+project+report+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_off0000d8bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8BF 10828 bytes
SHA-256: a350e1c355844bb6418495af931f044c9330e8ac53536d7edc9fd5ce7ad9193b
font_01_sfnt_off0000f17a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF17A 16520 bytes
SHA-256: 3336a25e95667896ceafbe7eac910ca74e4bcad723ac3e00483e5ca5a8349bb5
font_02_sfnt_off00011c44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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