Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdb1880f61117052…

MALICIOUS

PDF

87.4 KB Created: 2021-09-04 11:48:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bae39bd6d408bf07643c9e3074c7a34a SHA-1: fe2e06fb55aeacf69f5805721a8536925ca9fbfa SHA-256: cdb1880f61117052eed728c3b47191692758e68b00944823b379ced4afec5b27
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites and disposable domains. These links form a link farm, a common technique used to distribute phishing lures or redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://hoshitorionline.com/uploads/files/xoxuwizatukumuzokubik.pdf In PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/sr8al5cml8hb9u0gs441lgatu6/rojusimixekere.pdfIn PDF document text
    • http://conflictfreeelectronics.com/ourprojects/chowki/UserFiles/renuka/file/kavediwageduxelusumotu.pdfIn PDF document text
    • https://madhubanindiancuisine.com/nbloom/fckuploads/file/67149516812.pdfIn PDF document text
    • http://clasesholandes.com/userfiles/file/zevefemovajifidanaj.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608bd417f2efd---veledowejat.pdfIn PDF document text
    • http://abwvictory.com/uploads/files/rorudimedojevigitavazupi.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/tufinefuvo.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/q09u7rd9gd1p0k6tpjtetmha0n/jadojidilujekibufupodod.pdfIn PDF document text
    • http://chipgene.com/image/files/20210713_233307.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160dd751f698c3---vuwaxemozinokirubop.pdfIn PDF document text
    • https://bestrecycledautoparts.net/images_i/file/nebaxisedegukavuvojitu.pdfIn PDF document text
    • http://nextgt.eu/uploads/file/givixezadiwisa.pdfIn PDF document text
    • http://laserinnsbruck.com/static/28580795184.pdfIn PDF document text
    • https://actorconseil.com/files/file/fejubi.pdfIn PDF document text
    • https://clubkdo.fr/img/pics/files/jafekopukuvikoturatu.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/8cc6ffacafcd1e7e4ecea2f35c9ee9ad/saridoxamerilifumig.pdfIn PDF document text
    • https://cs168.tw/upfiles/editor/files/ralor.pdfIn PDF document text
    • http://toyotaquangninh.org/data/dulieu/files/17625779853.pdfIn PDF document text
    • http://telmeed.com/web/ckfinder/userfiles/files/35163105693.pdfIn PDF document text
    • https://www.shamshabaddiocese.org/files/js/ckfinder/userfiles/files/45163127548.pdfIn PDF document text
    • http://yule-sign.com/upload/editor/file/20210624220014.pdfIn PDF document text
    • https://kit-veron.my/ckfinder/userfiles/files/tuzugigeboluz.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/i98pk2dgjbn6bf48mqq1l27j47/lidebagezoberi.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/14132104940.pdfIn PDF document text
    • https://whitegold-eg.com/userfiles/file/97946511450.pdfIn PDF document text
    • http://sicilyontable.it/userfiles/files/wibiwizobatavubonuva.pdfIn PDF document text
    • http://eventechsite.com/files/files/91905481767.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=kanun+keseksaan+pdf+freePDF 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_off0000f53f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF53F 16484 bytes
SHA-256: 8eabffe8492b079af0217755205d6571ce2d04202e94c51b34f05384b1121ba3
font_01_sfnt_off0001203b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1203B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013852.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13852 10316 bytes
SHA-256: 0607c7bbb289b09e9313ca23f7f85ebdee18c8bd89e93180a02e36ab00f67ae2

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