Malicious PDF — malware analysis report

Static analysis result for SHA-256 11a41edbad0bd9e4…

MALICIOUS

PDF

85.9 KB Created: 2021-09-13 11:26:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1d2c6e26023d8e8fb03f180fba5439c6 SHA-1: 1741f9e7b88ba783cff8aa342d70cae7134e5a54 SHA-256: 11a41edbad0bd9e407117cf7be6d6f64488608fb92a05eb7b2cab30cb6973dcd
172 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories, presents a deceptive download button and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 8

  • 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.
  • 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.
  • 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://djecijagarderoba.me/userfiles/file/wamawonubirinopitupamija.pdf In PDF document text
    • http://eminenceinc.com/userfiles/file/fagososivom.pdfIn PDF document text
    • https://radiosmile.hu/upload/file/porotabovixowogatigip.pdfIn PDF document text
    • http://gsnursing.in/ckeditor/ckfinder/userfiles/files/benubidat.pdfIn PDF document text
    • http://poliinc.com/upload/files/kowobuteguvusaxala.pdfIn PDF document text
    • http://marklaliberte.com/fckupload/file/59989462669.pdfIn PDF document text
    • https://vili-al.com/uploads/wysiwyg/files/likujizonobusamoxuzikugoz.pdfIn PDF document text
    • https://chachachat.info/js/ckfinder/userfiles/files/88450626865.pdfIn PDF document text
    • https://nazragame.com/calisma2/files/uploads/vuzajubutu.pdfIn PDF document text
    • https://tumsad.org/img/editor/image/file/wusenaki.pdfIn PDF document text
    • http://dohertylaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/13582269463.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613ec526c7d3a---76023961977.pdfIn PDF document text
    • https://dichvuketoansg.com/luutru/files/rawamumijexus.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef9312eb8b---31867048797.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/81775852333.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/litulareduzegofijikoxik.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/16135a2da72ac2---zevakofo.pdfIn PDF document text
    • http://gzcil.com/uploadfile/files/70729299187.pdfIn PDF document text
    • https://mehfermobilsaglik.com/userfiles/file/63108095189.pdfIn PDF document text
    • https://maciejabramowicz.pl/upload/files/file/tabuwugimazavovufixegam.pdfIn PDF document text
    • http://tcsm62.org/uploads/news/file/xuropakerekunavod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=bet365+mobile+android+downloadPDF link annotation
    • https://easyown.ddproperty.com/datas/files/gipanetida.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_off0000e369.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE369 19772 bytes
SHA-256: 0da77cc61b057262fed66ca20d14863f9fb23e5289a5c7afc84d85ef54890cc0
font_01_sfnt_off0001172d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1172D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F44 10996 bytes
SHA-256: f2f0eb7465d29dc02d16f5cce68e97f62c6a3a0c6d05d25f386a9f6ae3a46043

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