Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0ce569064b643a1…

MALICIOUS

PDF

72.8 KB Created: 2021-09-02 22:23:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8c1bef26909984e7741632e792d235ab SHA-1: 36322653f3cf2d69e55896655229cfcae6e02b11 SHA-256: a0ce569064b643a152c007d826f82d55a9f714075cd437084257ef301c22d3a6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other domains. These links likely serve as lures for phishing attacks or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://pistant.ru/uplcv?utm_term=maharashtra+map+pdf PDF link annotation
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a31979b30cc---tujudowefefuneda.pdfIn PDF document text
    • http://entrackintl.com/uploads/81228090362.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/699a6ae177ca802ace6b5adbd8fb3a6c/juzidufibinugigepaxam.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/16764493dfc59fd59034f267f440ff18/20215639522.pdfIn PDF document text
    • https://autotrans911.com/thread/admin/uploads/file/24891593431.pdfIn PDF document text
    • http://hosungtour.com/FileData/ckfinder/files/20210627_9BA91180088F01AF.pdfIn PDF document text
    • http://rghsalumni.com/clients/82979/File/80813722263.pdfIn PDF document text
    • https://lingchuanfloor.com/app/webroot/userfiles/files/xonupukuwejubimefo.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/70009277498.pdfIn PDF document text
    • http://thestarbusan.net/FileData/ckfinder/files/20210617_D8915EE68BBA7ACE.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d37de9208e---dakowubaxovojatewesibewu.pdfIn PDF document text
    • http://ghhs1968.com/clients/5/57/5762190d0a265df614d1f295a7060a42/File/demotozulenugab.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e20e3db00c---venabomaxutigamifara.pdfIn PDF document text
    • http://tuvanthanhlapcongty.biz/upload/ck/files/72895135843.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/viloteda.pdfIn PDF document text
    • http://frigotechreina.com/userfiles/files/73017877698.pdfIn PDF document text
    • http://studiomarcheluzzo.it/userfiles/files/wopanixuwetenawonu.pdfIn PDF document text
    • https://nepalmicrofinancesummit.org/userfiles/files/mibijodonemukulafimevi.pdfIn PDF document text
    • http://signexpowholesale.com/project-new/christianbook/upload_images/file/govinamofumuwokefijutexu.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160da154840751---repukade.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c89f52b9fe2---82593350755.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/2o3eget4bf94qtrg2d1m5dqeq6/dukavapigudoziderud.pdfIn PDF document text
    • http://happysmilecard.com/uploads/files/xotekukuvu.pdfIn PDF document text
    • http://njnccualumni.com/clients/0/05/05b55d2c4c342460da0dc2f503861b12/File/zejuzanimekuxilapojinil.pdfIn PDF document text
    • http://ngocphuocjsc.com/public/default/ckeditor/files/vomobekedovebusepoge.pdfIn PDF document text
    • https://ceccarmehedinti.ro/userfiles/file/39411101534.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_off0000bcf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCF7 16212 bytes
SHA-256: e09e58f7fa4f404130c152074259157beefdb866fb45239c8cd1d481c77a4282
font_01_sfnt_off0000e6ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fec5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC5 10264 bytes
SHA-256: 412191bc95f377f375219328c4430a165a30e1e0de889cb16bb50177d14b9cf3

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