Malicious PDF — malware analysis report

Static analysis result for SHA-256 29d4d73d34de9564…

MALICIOUS

PDF

75.2 KB Created: 2021-09-14 13:25:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4fd2fd7c5133cc2c3df3821ca5f78dee SHA-1: 27b6317f49bc7f01dc61de7ccf04a6fc88017e94 SHA-256: 29d4d73d34de95647185205ea0ed038b60b82760f74cb81007ed3a7d7beff093
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains embedded JavaScript and numerous external links, some of which point to compromised WordPress upload storage or are part of a link farm on disposable hosting, suggesting an attempt to distribute malware or conduct phishing. The presence of embedded JavaScript indicates an intent to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://viacaosaopedro.com/www/js/ckfinder/userfiles/files/patuxikuwadadusodafo.pdf In PDF document text
    • https://arab-hams.com/Ups/files/noketom.pdfIn PDF document text
    • https://allcondosales.rodeodrivecondosale.com/userfiles/files/97228596311.pdfIn PDF document text
    • https://linhquan-group.com/upload/ck/files/24391728349.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139b4f43b9ef---lozumaberimotewowejiw.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210902230220.pdfIn PDF document text
    • http://angerdress.store/ckfinder/userfiles/files/77832542136.pdfIn PDF document text
    • http://fewo-spreewald-schoetzigk.de/brandenburgtag/img/editor/file/29601521255.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613d440b1d87f---84655566602.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/bepevorejewoteragezex.pdfIn PDF document text
    • http://obkladlazby.cz/userfiles/file/fikadolakovoxam.pdfIn PDF document text
    • http://bdsps.org/slbdavbatala/userfiles/file/57386941924.pdfIn PDF document text
    • http://jljemc.com/upload/files/92493310062.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/407b90fb5eea0d245465a264bd44d6f8/1315778801.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///2021090515151_579074190.pdfIn PDF document text
    • http://sportsclinicwest.ie/media/contents/file/bekofufavototodun.pdfIn PDF document text
    • https://vantainoidia.vn/ci/userfiles/files/73931371632.pdfIn PDF document text
    • http://urdu-hadith.com/survey/userfiles/files/63313056942.pdfIn PDF document text
    • https://pavillonwohlen.ch/userfiles/files/1974463997.pdfIn PDF document text
    • http://prosefkuchare.cz/userfiles/nowugujigixabetajaturegi.pdfIn PDF document text
    • http://urdu-hadith.com/survey/userfiles/files/fobogalojo.pdfIn PDF document text
    • https://www.theoakshealthcare.com/my_content/js/ckfinder/userfiles/files/sorus.pdfIn PDF document text
    • http://cinebuzz.be/uploads/userfiles/files/90803899731.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=new+devotional+ringtone+2021PDF 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_off0000c25c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC25C 10680 bytes
SHA-256: f2ffb1d9607ee3a4a30bca70909efee666ad63c105d150797f5bc7c0eb3f9184
font_01_sfnt_off0000dae0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE0 17168 bytes
SHA-256: 85f53fea96b5032f763f0edde31101c51a6434bfbbd94849e09a18dba38052f9
font_02_sfnt_off00010715.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10715 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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