Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba83bf10552ce43e…

MALICIOUS

PDF

100.8 KB Created: 2021-07-27 16:16:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e274760ec0a671c41d17da6e4a7dc903 SHA-1: d9f7c3d8dd6e921d28bf1d565ebb30b9d9f8b325 SHA-256: ba83bf10552ce43ec5f1977b4219e9fa8e1ea1a579ce8bdf9902baccb4393bde
204 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The 'SE_CLICKFIX' heuristic indicates the document employs social engineering tactics to trick users into executing commands, likely to bypass macro restrictions. While no scripts were directly extracted, the presence of numerous embedded URLs, some pointing to compromised CMS uploads and disposable hosting, suggests a downloader or phishing lure. The document's structure and embedded links are consistent with a phishing campaign aiming to deliver a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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 http://anadarkogomezfamily.com/clients/7/76/76920377ef4e0cfe2c6e77079a05cbd4/File/xezoxizi.pdf In PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1608968cfdb981---25482379273.pdfIn PDF document text
    • https://kaemsp.org/upload/editor/file/xovipuroverojadevozabu.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc7501d338---lomasoziwedaxomatu.pdfIn PDF document text
    • http://www.armstrongre.com/files/files/gebinerubijif.pdfIn PDF document text
    • https://alate.org/admin/fckeditor/editorfile/5732988941.pdfIn PDF document text
    • http://hyunbulsa.org/~ewedd2/userfiles/file/59738201747.pdfIn PDF document text
    • http://chinajessie.com/seadata/data/uploads/img/file/162493458367.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/k1hfub1s5m5ad16u27lb4au4hm/foruvovoririvowuvexufit.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075325061fb7---damobupiwoduxu.pdfIn PDF document text
    • http://qhs1978.com/clients/d/dd/dd8db5a278a7ad55a2ada34b8e38ebcc/File/83415620317.pdfIn PDF document text
    • https://art4you.sk/editor_uploads/system/files/fezazezazuli.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/dugexonudemirojelo.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc9460d7e8---76498669285.pdfIn PDF document text
    • http://tecnoservizi.com/userfiles/files/rupokamitelenazovedajef.pdfIn PDF document text
    • http://nhatngungoisaoxanh.com/upload/files/bitiwifim.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/df0c7b6ce503f725e368fcfa518f8e5b/ruxuxalilo.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/135150fa764bcef763d1d8f9df848060/77981257679.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/de5965c080117285eab86813a02009e6/foxazimulenupasum.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607b33bd1eb2e---14080989907.pdfIn PDF document text
    • http://bioscipublisher.com/files/upfiles/file/wewas.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/4sobfo63r47j2p87p2reqin0bk/dizosofu.pdfIn PDF document text
    • https://teenvolunteerhouston.org/wp-content/plugins/super-forms/uploads/php/files/bdcf6cacfc407d462c0257416f4dd06e/vemajepidibawonavad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=kcse+biology+paper+2+2018+questions+and+answersPDF 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_off00011e70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E70 11768 bytes
SHA-256: 63f1ec7b9fc44b568eade60fd3905058128110e5e21cc837f16432a2f0d50494
font_01_sfnt_off00013a22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015234.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15234 18256 bytes
SHA-256: 2347103c4994e17f5875b8ffe0da051b97ff6c9e3e420a6278783b227d82ea13

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