Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae04edecc35ac2a8…

MALICIOUS

PDF

92.1 KB Created: 2021-09-07 21:57:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 2c6cdebfef3b4c33683f610ffaa0df89 SHA-1: 76b75e426e3bfcddbd21b821c8519f21f80ed531 SHA-256: ae04edecc35ac2a8d694dd4967a842cec7d9fc4a04bfc58891edb0038c5d09e9
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. The embedded URLs and the nature of the heuristics strongly suggest this PDF is designed to lure users into visiting potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 http://jtylek.pl/Upload/file/77582029854.pdf In PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/6resefmsn1c9ln58t3v7jr7jk7/mobusotiwuzigeraj.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7277c1e70---nuxofimoduwigomesita.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/43068459856.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/4adc266faca254d8c42ff59d5a127ce8/putupuzidenanawa.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b861539b44---wodenikotebiga.pdfIn PDF document text
    • https://moiatakashta.com/userfiles/file/47356216794.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/o6uul85jvh301fd87e3e3eucd3/lokalupinur.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16134bd8ddb7b2---rowoxeruka.pdfIn PDF document text
    • https://joinvita.com/neu/userfiles/file/31686731992.pdfIn PDF document text
    • http://kargo-box.com/uploads/files/39543393559.pdfIn PDF document text
    • https://guptajimarriagebureau.com/userfiles/file/7881142236.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/98376175167.pdfIn PDF document text
    • http://fsnmmaterials.com/UPFILE/userfiles/files/nisilaxanopaxewini.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/161226792028b6---jananaxez.pdfIn PDF document text
    • http://oldtimerclub-thueringerberg.at/images/file/podixi.pdfIn PDF document text
    • https://rajatotogroup2.com/contents//files/89508424982.pdfIn PDF document text
    • http://sequirk.ie/userfiles/file/xejovexenidoletexakorigo.pdfIn PDF document text
    • http://poongdung.com/FileData/ckfinder/files/20210728_3E7B8C16A52A3053.pdfIn PDF document text
    • http://memsports.com.br/admin/libs/ckeditor/ckfinder/files/pazepojoregigalupusudi.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/cbf81e2e00f0ef8003944514fd010bc4/nivagaledujesuwiwiporamuj.pdfIn PDF document text
    • http://dynamic1984.com/user_file/file/jinodabetenumurir.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb9fc1c5abd---dexezedubomakobufa.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612f945d42cab---talab.pdfIn PDF document text
    • https://funbugs.ie/files/file/wedeg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=importance+of+technology+in+the+workplace+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_off0000fea0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA0 19324 bytes
SHA-256: 69d6cc83edcaedf9eee3c732ef8bb3207c9d7949a519c0246c3cc61060c79136
font_01_sfnt_off0001307d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1307D 11140 bytes
SHA-256: 4fac661e53673844670197bb9a95e877e624291d6655b48a500b95b13eecb636
font_02_sfnt_off00014a1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A1F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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