Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b0f74bab2eec031…

MALICIOUS

PDF

83.0 KB Created: 2021-09-07 05:32:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d8e8d6366db8136b1947cbe7e9f3b1b5 SHA-1: 147ce52574bbfdabb7514773f69c327835f13977 SHA-256: 2b0f74bab2eec03152d732c64077d28b1463f771c3b5d93c5b466e4b7bc77c64
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. No scripts were extracted, but the structure and URL analysis strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://bluetact.com/locktactyuma/userfiles/file/posetolemosabaponiku.pdf In PDF document text
    • https://equator-maritime.com/userfiles/file/30730714102.pdfIn PDF document text
    • http://wxeina.com/userfiles/files/70211003092.pdfIn PDF document text
    • http://collegium-connect.nl/ckupload/files/nekufiwezebedojigagited.pdfIn PDF document text
    • http://recviem.ru/img/upload/lasuxexijuru.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100b74bc5404---tojefoxoluner.pdfIn PDF document text
    • https://veterinarycarefoundation.org/userfiles/file/69912897522.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/putifapib.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608844607a481---puvinirubaxasixujukasun.pdfIn PDF document text
    • http://simonide.org/userfiles/file/71985800820.pdfIn PDF document text
    • https://rafautama.com/uploads/file/keludidiputi.pdfIn PDF document text
    • https://tangentemag.com/img/file/48791140407.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/95972652528.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/16783868126094c9dcb1ee3.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/45030175938.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/sinubusebaraxurufike.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/29a2b5bb597c04e7f5cf666f54f5ea52/dawotofusonowomunu.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095fd48c40fb---53022836578.pdfIn PDF document text
    • http://bsp-oblspl.org/ckfinder/userfiles/files/85084331012.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd48a13ea9---78968240138.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c2f444e1f4d---29287168338.pdfIn PDF document text
    • http://www.nomorcantikjoss.com/file/98795531303.pdfIn PDF document text
    • https://euinsuti.ro/app/webroot/files/userfiles/files/mivotuxakimejabadipe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=seneca+falls+declaration+of+sentiments+and+resolutions+worksheetPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/8e64de9fce2cb8eeb4ba2067d125e8ec/xunojerisufazadugiwiv.pdfIn PDF document text
    • 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_off0000de7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE7D 11096 bytes
SHA-256: 412390a994d73f2ef29299f9e18a6413c43c1140a6c5355fd1867670b6c6e24f
font_01_sfnt_off0000f83c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF83C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001104e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1104E 17652 bytes
SHA-256: cda035d6aeba80ab532054e3e75001d08530bdf00a4750038557a4053dffab52

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