Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fefc51eacc71a76…

MALICIOUS

PDF

78.1 KB Created: 2021-09-11 06:13:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 95ec92af19c5b20e9a1c1e8a5badaa23 SHA-1: c037071710791c079f0dc13fd9abae64bae55696 SHA-256: 4fefc51eacc71a76b91f1e4e70510bbc00ef219e4f220515696f7196f2b5fea1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, and it contains embedded JavaScript. The PDF also functions as a link farm, directing users to numerous external URLs, some hosted on compromised WordPress sites, which is a common tactic for phishing or distributing further malware. The presence of embedded JavaScript suggests an attempt to execute malicious code within the user's browser or PDF reader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6206

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://szjg.hu/images/file/jasukota.pdf In PDF document text
    • http://www.performhabitat.fr/bundles/astadmin/js/ckfinder/userfiles/files/15606035472.pdfIn PDF document text
    • http://ubytovani-budejovice.cz/picture/vtextu/file/17598615516.pdfIn PDF document text
    • https://tinnituskozpont.hu/files/99072635663.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/6bf2bb0891b86ffe4cfca6381d5b7c70/jodek.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.net/FileData/ckfinder/files/20210908_CD449914E131EF15.pdfIn PDF document text
    • http://glampingcaravan.com/userfiles/file/20210909070601.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/84622063368.pdfIn PDF document text
    • http://xn--80ahcjevtqq.xn--p1ai/ckfinder/userfiles/files/buzaxakudez.pdfIn PDF document text
    • http://aa-nusd.jp/9292627753.pdfIn PDF document text
    • http://feuerwehrobrigheim.de/upload/files/98627908659.pdfIn PDF document text
    • https://simpangkanan.com/contents/files/10042492977.pdfIn PDF document text
    • http://ros.by/ckfinder/userfiles/files/13682323640.pdfIn PDF document text
    • http://hoteldanang.com/uploads/images/files/16727776.pdfIn PDF document text
    • https://fleseriuassociates.ro/files/file/tuvarewebega.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/mewumemav.pdfIn PDF document text
    • http://fszhenjia.com/upfolder/e/files/20210909211131.pdfIn PDF document text
    • https://mbbs.hr/files/71142861388.pdfIn PDF document text
    • https://interconformity.ro/images/file/70263346948.pdfIn PDF document text
    • http://cnwt.mgo.cool/upfile/files/2021/09/03/lowiwuxitejuwazokirurefuz.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/9cb492efdded980f44dc193a87046d41/85007702687.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132bfde09fd0---bukuxefisipigatigagumo.pdfIn PDF document text
    • http://www.recko.ru/ckfinder/userfiles/files/rulidumojobudirilesiz.pdfIn PDF document text
    • https://hiroyoung.com/data/files/38751525159.pdfIn PDF document text
    • http://philipwillettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/80554176772.pdfIn PDF document text
    • http://bimbrlata.cz/UserFiles/File/25976072306.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=rosner+biostatistics+solutions+pdfPDF link annotation
    • 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_off0000d104.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD104 10900 bytes
SHA-256: 4d45a38f57ddd2e174e3a9798a9a282b56a7cc5bc8a7906a72439876c4cd924a
font_01_sfnt_off0000ea21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA21 18548 bytes
SHA-256: 2297c865878a015ff5b9848b440159352c91cc891e03ef16d4355d1bf6ccfad7
font_02_sfnt_off00011a70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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