Malicious PDF — malware analysis report

Static analysis result for SHA-256 c56d55a07f28444a…

MALICIOUS

PDF

89.0 KB Created: 2021-09-09 05:56:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 398e711ebd776983f338bec51957c57b SHA-1: d56ca0e60f8e7a888ab6824f8d553e0d74c77d8b SHA-256: c56d55a07f28444ad0b24becd28f588b179556eb247f194047f342713325bad0
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress upload directories and other potentially disposable domains, suggesting a link farm designed to redirect users to malicious content. The PDF structure itself does not contain executable scripts, but the heuristic firings strongly indicate its purpose is to lure users to external, untrusted sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130bce35745f---86737008637.pdf
    • http://toyotacri.com/userfiles/files/79354041905.pdf
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613340d5686a3---22300141025.pdf
    • https://calprin.com/ckfinder/userfiles/files/luladeba.pdf
    • http://tchid.net/userfiles/file/tarawewifamesaketukivag.pdf
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/ea336a2263b23df7e0d1c45155320728/38539200258.pdf
    • https://trainova.com/userfiles/file/soxamegitizasapodadidig.pdf
    • https://tigapilar.com/upload/files/99697299135.pdf
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161306a8213f52---jeruwote.pdf
    • http://namngonviet.com/user-/files/49246807093.pdf
    • http://elandtour.com/FileData/ckfinder/files/20210906_AE884584A35F59C0.pdf
    • http://anthonyjcincottalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/72816678891.pdf
    • https://myclubowners.travelenvogue.com/userfiles/files/54731976250.pdf
    • http://acsalma.hu/userfiles/files/70252063456.pdf
    • https://lotteppta.com/beta/assets/file/41916941129.pdf
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/mvr1738jpusv9h7u1qbr34feh6/21346856349.pdf
    • http://www.workbythai.com/admin/assets/images/76424682750.pdf
    • https://0a3exp.com/upfiles/editor/files/87784827010.pdf
    • http://apexnepaltravel.com/userfiles/file/3740276131.pdf
    • https://sanipro.ma/app/webroot/uploaderfiles/92106123066.pdf
    • https://songhong-thudo.com/img/files/tusovujaseb.pdf
    • http://fcvperu.org/data/fcvperu/userfiles/file/52640677596.pdf
    • https://doanhnghiepvietnam.org/img_duhoc/files/rikexovikotixabapemud.pdf
    • https://sanvexe.vn/webroot/img/files/mikumivaxunoxofevirowuv.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=pantheon+file+manager
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4e2.bin
da09bae49db0eda5eb1421574bb2fb5d676e00bd258daa14b095bd853b803041
pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E2 18948 bytes
font_01_sfnt_off000126b4.bin
94d6755c6d79fbf3071f0bb9a2cc47e80a942f28a16e01031a45c9910d4e9b06
pdf-font-stream PDF embedded font (sfnt) at offset 0x126B4 10492 bytes
font_02_sfnt_off00013e51.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13E51 16792 bytes