Malicious PDF — malware analysis report

Static analysis result for SHA-256 1dcd889503ab955f…

MALICIOUS

PDF

83.4 KB Created: 2021-09-16 11:22:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: ad2a043dd52600e1d43c81fd4d7950fe SHA-1: 56d03266c8afc0980130143c1ca31b78f922ee99 SHA-256: 1dcd889503ab955f508b3909ae70b965faffc91d07ff3dc7520ec45d3168f754
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. It also features a link farm pointing to numerous URLs, many hosted on compromised CMS platforms, suggesting an attempt to obscure the final destination and evade detection. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware.

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://crysiq.ru/uplcv?utm_term=animated+wallpaper+maker+online PDF link annotation
    • https://moraure.net/js/ckfinder/userfiles/files/pipigizizen.pdfIn PDF document text
    • http://ferrocom-spb.ru/userfiles/files/beziwitamal.pdfIn PDF document text
    • https://vetamblj.si/ckfinder/userfiles/files/nutebiralelesesaw.pdfIn PDF document text
    • http://tetobox-budapest.hu/uploads/files/fajinawizowedizusotisulon.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613d657b773ef---buxogukupu.pdfIn PDF document text
    • http://lecostationery.com/files/file/1415103295.pdfIn PDF document text
    • http://claudiamelchior.it/images/file/38578140369.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/tlmakf58tb6r6jak7m64emruou/56195496449.pdfIn PDF document text
    • https://estoniapools.com/contents/files/72732536310.pdfIn PDF document text
    • http://xhzhengli.com/upload/40547589190.pdfIn PDF document text
    • http://studioesflores.pl/obrazy/file/juremojubodetuzekutukina.pdfIn PDF document text
    • https://hoongnau.com/upload/files/jizipotubavudadodebebin.pdfIn PDF document text
    • http://lexus-custom.com/js/upload/files/76707870829.pdfIn PDF document text
    • http://sumbulefendiegitimvakfi.com/resimler/files/guzop.pdfIn PDF document text
    • http://jjburgerut.com/uploads/files/24138250608.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///sekevusowiginerezolasi.pdfIn PDF document text
    • https://chulintemple.org/CKEdit/upload/files/vawifisoji.pdfIn PDF document text
    • https://dildendilecevirievi.com/upload/ckfinder/files/50761951255.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613538867d537---gogelaguzidopopufa.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/xuwukivotalozokaxis.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/d4b1deccd7028bd72596db441d354350/fodomumemixab.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/4696387d2e0df26ef0ca95d9ebd83a72/70268096075.pdfIn PDF document text
    • http://thevalleytrader.com/files/85428377428.pdfIn PDF document text
    • http://serramentisiciliano.it/userfiles/files/muriniwozirak.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_off0000dfbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFBF 18292 bytes
SHA-256: 8be922a9b124aeb29d545bbbbac4c57658d96b9518601006f7520e80abf61ea8
font_01_sfnt_off00010f5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F5A 10544 bytes
SHA-256: f12986b00f71c5ad0f1ac7631a51e04f5d310d18536cb09bee519f1fbf0d5a7c
font_02_sfnt_off00012763.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12763 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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