Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b70ac4ba92e481e…

MALICIOUS

PDF

76.7 KB Created: 2021-09-18 07:28:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9e2cddeef711d664690d06d4e2e0bc09 SHA-1: 0cc45a9df676bba28ee785934e360ff1404a24aa SHA-256: 7b70ac4ba92e481efa5ac8eebbf9e78c1d996ff7719558a1c93670508f9651c0
196 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by a machine learning classifier and ClamAV as malicious. It contains heuristics indicating it's a link farm hosted on compromised WordPress sites and a lure for clipboard command execution. The document likely instructs the user to copy and paste commands into a shell, which would facilitate the download and execution of a secondary payload, aligning with a phishing or trojan delivery attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f133040251---48324557771.pdf In PDF document text
    • http://fredericjean.net/oplusco/file/nosuzefewuloxini.pdfIn PDF document text
    • https://austarpharma.com/upload/files/momotibixofatono.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f976d0f990---22088720185.pdfIn PDF document text
    • http://kzlo.pl/fotki/fotki/file/34987488686.pdfIn PDF document text
    • https://rawoctane.com/uploads/file/nikeliloxixusasopukode.pdfIn PDF document text
    • http://telecycling.org/files/file/91642878177.pdfIn PDF document text
    • https://www.andreivieru.com/ckfinder/userfiles/files/moxituzelibetiv.pdfIn PDF document text
    • https://shidoremicrosys.com/media/17438112289.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/4f0q8dre4ksh94imelolaufd69/20065091129.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/88921855290.pdfIn PDF document text
    • https://alirezamirmohammadi.com/images/upload/files/sezuzajifitemele.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/xelevezuretubexozofivero.pdfIn PDF document text
    • https://goodmix-psc.com/userfiles/files/54738082978.pdfIn PDF document text
    • http://saraya-shop.ru/upload/files/37345498060.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161403a2b8c5bf---vukoteregigatipukuko.pdfIn PDF document text
    • http://kccmaul.com/files/files/xabevuv.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/16140d9518b666---wogarebudigewejad.pdfIn PDF document text
    • http://hzbmsj.com/images/upload/File/28774096670.pdfIn PDF document text
    • http://kimwendelldesign.com/ckfinder/userfiles/files/zafazezeduxul.pdfIn PDF document text
    • https://ptogel2.com/contents/files/siledake.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/161347acb85736---81785408423.pdfIn PDF document text
    • http://change4best.ru/upload/file/dujezidiniwopur.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210905030341.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f409933a81---46813039935.pdfIn PDF document text
    • https://3drm.bg/uploads/pictures/files/dezuvotomatefenadusogopam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=jvdroid+ide+for+java+apkPDF 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_off0000c7e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7E5 17324 bytes
SHA-256: 0e94198fdc8023fa0f0c11a06aaf9539fd0924959b9ead2a24919247a0a39f27
font_01_sfnt_off0000f529.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF529 10356 bytes
SHA-256: fbc0264a3d8c7dd792f80ffe5da37c88ec0f76eece40185af313d7cd04c76aab
font_02_sfnt_off00010ca3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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