Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5a0fa926233d687…

MALICIOUS

PDF

80.4 KB Created: 2021-09-23 02:27:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: a7eafba564a7f48d9f97ce3213929bc2 SHA-1: fe9bebb773c1dcd0bcd7937fae7280b2019f4486 SHA-256: a5a0fa926233d68705aa75806e70bedc6a9800d4b367fbd3c9955cb37ec1f338
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, including links to compromised CMS uploads and disposable hosting, suggesting it functions as a lure to external malicious sites. The primary purpose appears to be directing users to potentially harmful content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://laborke.ru/uplcv?utm_term=mugen+train+english+dub+full+movie PDF link annotation
    • https://binarbaidrealestate.com/public_html/userfiles/file/75192936023.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/fajed.pdfIn PDF document text
    • http://ahnil.com/userData/board/file/xitokosakoninomab.pdfIn PDF document text
    • http://metafelix.it/userfiles/files/gumifufesuwaxe.pdfIn PDF document text
    • http://bjdfszwy.com/filespath/files/20210917154753.pdfIn PDF document text
    • http://mlead.net/images/e/file/59305424126.pdfIn PDF document text
    • http://www.sudeshnamaulik.com/fckimages/file/zalazi.pdfIn PDF document text
    • https://kuzeyilac.com/resimler/files/zetuxe.pdfIn PDF document text
    • http://cosmik-kinoteatr.ru/sadm_files/jixowekiril.pdfIn PDF document text
    • http://jingkangchem.com/upload/files/rozukageketefotikonu.pdfIn PDF document text
    • http://maryalo.com/userData/board/file/25640349520.pdfIn PDF document text
    • https://profession-your-dr.com/uploads/files/202109221808426012.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/gbd393u7cqdjvi7m8mvj24jnoe/31605427416.pdfIn PDF document text
    • https://tecnomatec.cl/upload/file/6132237028.pdfIn PDF document text
    • http://tsraccountants.nl/mailing/images/photo/file/serinutiniwutirozow.pdfIn PDF document text
    • http://centonze-vini.com/userfiles/files/nadifevupudebovira.pdfIn PDF document text
    • http://c-amc.com/upload/files/legivazetesidetavuwele.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe8e9d46b6---98972033608.pdfIn PDF document text
    • http://gloria-eurex.com/images/blog/file/kowadazedizesebategalazu.pdfIn PDF document text
    • http://sportsbettingconsultants.net/cote_dor_import/admin/ckfinder/userfiles/files/58066489018.pdfIn PDF document text
    • https://ctcitsupport.com/media/files/padalisifowaveweviximed.pdfIn PDF document text
    • http://blccy.com/userfiles/files/86437193601.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/84823770d342ae1865babd40c0780cc8/12180453274.pdfIn PDF document text
    • http://titibbs.xyz/js/ckfinder/userfiles/files/65878415042.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_off0000cf7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF7A 19412 bytes
SHA-256: 6da5bf561e86332e2cbf6e9f7fa264e5b39420237470442eb1030cf93ecd44e2
font_01_sfnt_off00010214.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10214 11100 bytes
SHA-256: 0afa5074a39e040a04d7f6ea5b76a6972e3d8037f1e23e0e4a20bbbfcf369a45
font_02_sfnt_off00011b91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B91 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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