Malicious PDF — malware analysis report

Static analysis result for SHA-256 1321112cff5501e4…

MALICIOUS

PDF

70.6 KB Created: 2021-09-29 01:44:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 482729e9879f36a52245727f20f4f1bb SHA-1: 4690e13978be7236e6eecaa7e1406e9230118010 SHA-256: 1321112cff5501e457053d16b0e1e7a7b603191b7dc07a51b8e6ebd5686ccd54
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of numerous unknown URLs indicates a broad distribution effort.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://ph-easycome.com/userfiles/file/ruwerinatavuvalufaxudeta.pdf In PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/c9c17f2bacadfd547fa19b20388fd4d6/tuwafo.pdfIn PDF document text
    • http://graczeonline.pl/userfiles/file/petufazowosuvu.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1613d08ebd6a9e---23393774900.pdfIn PDF document text
    • http://fkjz.cn/upload/files/2021/09/202109231134257106.pdfIn PDF document text
    • http://dreamsurgerycn.com/ckupload/files/kowexedenusonevizixixer.pdfIn PDF document text
    • http://fortwashington.abwingsmd.com/uploads/files/31422019774.pdfIn PDF document text
    • http://xn--80aikni6a0b.xn--p1ai/images/file/60356234668.pdfIn PDF document text
    • https://smwebtechnology.com/arishayurveda.com/userfiles/file/47414783396.pdfIn PDF document text
    • https://ermolino.mebel18.com/uploads/files/sagobajevumafomilegil.pdfIn PDF document text
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/75685657881.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139b7af577e9---53733979862.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/8f882c8a94727e27fff52339c29f20a6/julubodivexizunovunuxosu.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/108498673761443f3b554e5.pdfIn PDF document text
    • https://yk-tech.com.tw/ckfinder/uploads/ckfiles/files/dilefaxaxidomawonewidop.pdfIn PDF document text
    • http://sisparts.pl/zdjecia/fck/file/wobumud.pdfIn PDF document text
    • https://cebubigsellers.com/userfiles/file/57479796974.pdfIn PDF document text
    • http://sp2wronki.pl/fotki/fotki/file/xedujulutubudiruwa.pdfIn PDF document text
    • https://gastrotest.co/ckfinder/userfiles/files/tajinodifukubibomojok.pdfIn PDF document text
    • http://dotykbylinky.sk/_subory/subory/tuzadovifuduwazejanijata.pdfIn PDF document text
    • http://olgapolyakova.de/files/files/7737293588.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/571prcd1mvhbn4pii3o7n9s9d1/85598286583.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/9917129871.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/tuvuz.pdfIn PDF document text
    • http://zechnerbau.at/images/content/files/69994417.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=fix+android+black+screenPDF 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_off0000b448.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB448 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC5F 10576 bytes
SHA-256: 8725a91d390cd76246bcbad32be5550ed051b0abb481ffe3ab8296e54752d120
font_02_sfnt_off0000e486.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE486 15848 bytes
SHA-256: 7820da1f889903e55d8c67289c00124ce551797a54a9659e0f35fce15ba13b3e

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