Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e29e1d4f9ba8dc8…

MALICIOUS

PDF

82.8 KB Created: 2021-09-10 02:46:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 15e67765ca20e35dc956a5332a2182b5 SHA-1: edd2d766a03cd09a0d67a5bc958122b584f5c146 SHA-256: 1e29e1d4f9ba8dc8df39d2281f562c22037acb9848a7b20b158329d80fecf2db
164 Risk Score

Malware Insights

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

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. It also functions as a link farm, directing users to multiple external URLs hosted on various domains, many of which appear to be compromised or disposable. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://crewmak.ru/uplcv?utm_term=stop+automatic+download+whatsapp PDF link annotation
    • http://willowslakerhea.org/userimages/13719068686.pdfIn PDF document text
    • http://tyextractor.com/d/files/zejidadotexawuvitivupidal.pdfIn PDF document text
    • http://rts-3.ru/upload/files/vuviti.pdfIn PDF document text
    • https://suacuachuyennghiep.com/uploads/files/79028489362.pdfIn PDF document text
    • http://palazzodiaz.com/userfiles/files/vodajezivog.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/e7b978acfc972a6b48246931674c48bb/24917818827.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613a03911e9d5---lawakezox.pdfIn PDF document text
    • https://kovtec.pl/eurostyl/photos/file/61946342269.pdfIn PDF document text
    • http://gradn.ru/uploades/fckeditorfile/84162362427.pdfIn PDF document text
    • http://bolt.fo/public_html/userfiles/files/40266280448.pdfIn PDF document text
    • http://tongchangkj.com/uploadfile/file///2021090506031218.pdfIn PDF document text
    • https://toppelletmachine.com/d/files/95145039160.pdfIn PDF document text
    • http://frutapac.com/ckfinder/userfiles/files/fewusizoxinot.pdfIn PDF document text
    • http://precisao.org/files/files/gebimekikasa.pdfIn PDF document text
    • https://esterkins.de/ckfinder/userfiles/files/94724605060.pdfIn PDF document text
    • https://jeevandeepspecialcare.com/ckeditor/ckfinder/userfiles/files/37212268175.pdfIn PDF document text
    • http://www.mananthavadynorbertines.org/www/js/ckfinder/userfiles/files/44439365515.pdfIn PDF document text
    • http://machinegroup.ru/img/outer/files/zalafuf.pdfIn PDF document text
    • https://polymadeniyaglar.com/fckeditor/userfiles/file/1579499395.pdfIn PDF document text
    • http://architettipassarinmarzotto.com/userfiles/files/83142262828.pdfIn PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/josajasef.pdfIn PDF document text
    • https://masukpt2.com/contents/files/zibapagevukigekew.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/71628130719.pdfIn PDF document text
    • http://veewood.com/file_media/file_image/file/wuselexegixe.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135a0033d1aa---94748644591.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_off0000ddd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD7 10808 bytes
SHA-256: b42915f1d9dfd5da45ad4a121613949ed50510f9f154079af5b8167da7d70b03
font_01_sfnt_off0000f698.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF698 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010eaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EAA 18156 bytes
SHA-256: ccefd747cb323bb60ebc1669e98d8a425fff2b2ab647eb67bd89926e835ce458

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