Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5b002a3974d3b8b…

MALICIOUS

PDF

89.7 KB Created: 2021-09-01 06:07:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e1b749d756aae3d021a9cafd5d1f50c2 SHA-1: 0981f1fbcb990e514f41c7abf492482138c1204a SHA-256: a5b002a3974d3b8b1a5ff1604108e12e70d2f72ec24ac4fafb118c32da781aea
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised CMS upload directories, suggesting it is used to distribute further malicious content or phish users. No scripts were extracted, but the PDF structure and URL patterns are consistent with phishing and malware delivery campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://tai-yang.tw/taiyang/upload/file/18396627860.pdf In PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/4kn86mcdb25a9jilbq119lahld/40337966653.pdfIn PDF document text
    • http://resurrection-life.net/userfiles/files/tefanepe.pdfIn PDF document text
    • http://stroyvodservice.ru/upload/File/faporowe.pdfIn PDF document text
    • http://zamaro.cz/images/fcke_files/file/pinifatefoluwotu.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/au1mgblhdbsv5bcs0lflpbg9f1/58419750929.pdfIn PDF document text
    • https://fenixfalt.com/userfiles/file/85493355164.pdfIn PDF document text
    • https://goldgreiner.de/userfiles/file/87430765718.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/da1e7f8855758e4d79b5e6f0ae10a162/junatajadukajaxowur.pdfIn PDF document text
    • https://cafemocion.com/userfiles/file/xaxewozenigazefatozil.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/b2bfd227dd82fe9608df7e3a5c2aac68/sazusenolexetuze.pdfIn PDF document text
    • https://apizf.org/public/file/8032078754.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160920ac90fd0f---loxagudetezepuxinadexe.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160829e432b6a9---foforufalipidoxafexo.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082688deb0bb---wokuloputubelelemulibon.pdfIn PDF document text
    • https://e-uchebnici.com/img/file/42226284738.pdfIn PDF document text
    • http://inlovehuahin.com/file_media/file_image/file/ferure.pdfIn PDF document text
    • http://maraulsan.com/ckfinder/userfiles/files/noxovufe.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/031ed25336034288816ce57b9f9b774a/zaxux.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cde50b2b82d---77434401513.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/gemiwimanamagefamopal.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608a2debb4d0a---tezajeko.pdfIn PDF document text
    • http://vorne-sitzen.eu/pcms/content/file/vidufozewedene.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c970885237a---486437868.pdfIn PDF document text
    • https://xaydungdonggia.com/app/webroot/files/images/pages/files/muzapakuxiwuzigimak.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16095b2e92adcf---9773171663.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=summer+olympic+eventsPDF 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_off0000f6b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B6 18892 bytes
SHA-256: e4941f312143fbf01dcc2672cc24101847be6d268d6254b5adb04d1e0a677b5e
font_01_sfnt_off00012740.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12740 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013f57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F57 10728 bytes
SHA-256: 814ae4044ff97910947c11030fa7cf62a507abd640b7cc0044ac0c2c72b90575

Open this report in the interactive analyzer, or submit your own file for analysis.