Malicious PDF — malware analysis report

Static analysis result for SHA-256 343c7c9796ae0c7c…

MALICIOUS

PDF

79.2 KB Created: 2021-09-13 17:58:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 209c353186237c96d56f5c6d8ab3fe42 SHA-1: dc09dabd308cdd7ec5d78e74817ae23bcf60ebf0 SHA-256: 343c7c9796ae0c7c2989e4a1ecadbb19a726b6ddda431b61be11cdf35b917e47
164 Risk Score

Malware Insights

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

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also functions as a link farm, directing users to multiple external URLs, some of which are hosted on compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://stroyindustry.com/userfiles/file/lilibut.pdf In PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e0519b7642---pebopitisoxagodo.pdfIn PDF document text
    • https://imad0c0.com/js/ckfinder/userfiles/files/8888237141.pdfIn PDF document text
    • http://salsainkonstanz.de/media/files/palixasobafodobo.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/68163c5f422c38d5f00a9339d7ff9058/tegitovugerizinokerixe.pdfIn PDF document text
    • http://architettodrabeni.it/userfiles/files/15428241047.pdfIn PDF document text
    • http://stavo-bazar.cz/userfiles/file/vinefunafe.pdfIn PDF document text
    • https://gs-hemeringen.de/ablage/userfiles/files/zojavugidikuduve.pdfIn PDF document text
    • https://matras-matrasych96.ru/admin/ckfinder/userfiles/files/ruxoxomagegivabigiw.pdfIn PDF document text
    • http://pensionpoint.cz/userfiles/files/tigofiligiluzobedik.pdfIn PDF document text
    • http://wx-bm.cn/upload/ckimg/files/202109130648196570.pdfIn PDF document text
    • http://ldkxzzs.com/images/userfiles/file/84771541315.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/7c6fa1034c01cc751fe2a54eff53d899/tameraxi.pdfIn PDF document text
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/74844441124.pdfIn PDF document text
    • http://frutapac.es/ckfinder/userfiles/files/85132124131.pdfIn PDF document text
    • https://valgott.com/images/userfiles/file/65625690369.pdfIn PDF document text
    • https://tepatsasaran.com/contents/files/22740029121.pdfIn PDF document text
    • https://komunalno-vrgorac.hr/files/91656276690.pdfIn PDF document text
    • http://elma1.ru/!upload/files/54400577648.pdfIn PDF document text
    • https://kisikana.hr/UserFiles/files/dagilasito.pdfIn PDF document text
    • http://djarkitek.com/temp/vinney/HTML/userfiles/file/62004367611.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161390aaf1edf0---42500732653.pdfIn PDF document text
    • http://debandhelder.nl/ckfinder/userfiles/files/dewobomufizij.pdfIn PDF document text
    • http://netart.hu/userfiles/file/kasaxel.pdfIn PDF document text
    • https://condicionamentofisico.com/arquivos/file/pakeladunewugagomubanapo.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161347e65644de---33073695530.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=st+xavier+mass+timesPDF 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_off0000d121.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD121 18084 bytes
SHA-256: 08437832ea30db653563a0159881dbec0ed762138c7da3f42594d720dc96b9b1
font_01_sfnt_off0000fffa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFFA 10244 bytes
SHA-256: ef1e25c1baa8779b75da029065ac398977d838ef7fb7f10a15c7695cc223e81c
font_02_sfnt_off00011709.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11709 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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