Malicious PDF — malware analysis report

Static analysis result for SHA-256 5737ed43b04e6ffb…

MALICIOUS

PDF

81.1 KB Created: 2021-09-04 07:46:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3197cf7c4af9cd530c2e8cb40ed2468e SHA-1: 48ea9eb3a9b4f1b3369f6009f839ab0e8027fcf7 SHA-256: 5737ed43b04e6ffb508b1371e7d9b380ce29eca5ae096284995082b533613cce
176 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier with high confidence. It contains numerous embedded URLs, many of which point to compromised CMS uploads and disposable hosting, suggesting it functions as a link farm for phishing or malware distribution. The heuristic 'SE_QR_LURE' indicates the document may also instruct users to scan a QR code, further supporting a phishing or social engineering attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://brookhavenclassof1967.com/clients/0/0c/0ca802fc87877f8c548ddf85495caeb2/File/siwunuvabudiwidenu.pdf In PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/2fao1i6pmmebjdje9g4fte7mqo/vebozadijanu.pdfIn PDF document text
    • http://sakem.org/userfiles/files/fodurekinoxoboxuwowanate.pdfIn PDF document text
    • https://sinhadventure.com/uploads/file/33909333207.pdfIn PDF document text
    • http://haitrungkim.vn/uploads/userfiles/file/38489286352.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f408924aec---9594619373.pdfIn PDF document text
    • https://ourcampuswindow.com/ckfinder/userfiles/files/83338878021.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610f448770c26---jivusipidasa.pdfIn PDF document text
    • https://razredna-nastava.net/files/77285812506.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/8ec2300cf103986e6b51b3b3350ad375/mofukupitokopakonurali.pdfIn PDF document text
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/2363003205.pdfIn PDF document text
    • https://akilanews.com/ckfinder/userfiles/files/xeramosa.pdfIn PDF document text
    • http://aite-materials.com/upfiles/file/rinirowu.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/70e4677b1b51d26f55d878b3060fa745/tatulemevizaxanevugojiso.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/a66a644a9be1315c722c645a20cc6f11/mofega.pdfIn PDF document text
    • http://xutricolor.com/uploadfile/files/zedewukesekemiki.pdfIn PDF document text
    • http://anoh.net/pds/userfiles/files/zamozabulelivujokov.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/jizovejowegexavaxik.pdfIn PDF document text
    • https://pharmnet.cz/ckfiles/files/files/rukexufelexikegezuxu.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f6245c4005---93364620706.pdfIn PDF document text
    • https://dietacud.eu/upload/file/11044515869.pdfIn PDF document text
    • http://emirates-offshore.com/uploads/image/file/bipunenukibigavaboni.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=nest+pro+thermostat+manualPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f356.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF356 10500 bytes
SHA-256: 5ab454d3a45379103f5dbecc9c1ea0a08271a32b51a417807f40b49ec1633ace
font_02_sfnt_off00010b0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B0F 17232 bytes
SHA-256: 7b2b61ad3bcb87e0267fda9f26e19fc85f9804e025838ac657ebe18de9fe5f7e

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