Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cddb7f046808143…

MALICIOUS

PDF

78.8 KB Created: 2021-09-12 13:30:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 072ccf2380ceb44a96b313f9192e5e27 SHA-1: 38a8c12a3b5f8bb84a33803ba66550009d1dc920 SHA-256: 1cddb7f046808143df0683e774a0d91fbd4b3a66d118cb51a552e76756e87066
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many pointing to compromised CMS uploads and disposable hosting. These links likely serve as a link farm to redirect users to phishing or malware distribution sites. The embedded JavaScript, while not fully analyzed due to obfuscation, is a common component in malicious PDFs for initiating malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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://duda-tech.pl/dudatech/upload/file/55966060228.pdf In PDF document text
    • http://nissanotogovap.net/uploads/images/files/69798322581.pdfIn PDF document text
    • http://daiichibus.vn/uploads/news_file/zedaxasekerusadebigelaja.pdfIn PDF document text
    • http://zajazd-broadway.pl/galeria/file/puvadalubetaxon.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f89152c837---50531692559.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/161306c940b46d---takowejovujamu.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/29088bc150a2bdd7193ce5c46715b27a/ronebesipanibu.pdfIn PDF document text
    • http://ammk.sk/userfiles/file/94170105354.pdfIn PDF document text
    • http://xpeedon.net/userfiles/file/20210904173537.pdfIn PDF document text
    • http://gibisch.com/files/files/99030886692.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/25db65c0d73d6568e9aaff663ae30782/foruwuxadilo.pdfIn PDF document text
    • http://pooq-design.com/app/webroot/fckfiles/file/48816984493.pdfIn PDF document text
    • http://mebizstekla.ru/userfiles/file/21061053058.pdfIn PDF document text
    • https://youkuvpn.com/upload/files/zulufukadesaratosodo.pdfIn PDF document text
    • https://gkatsov.com/userfiles/file/39777137502.pdfIn PDF document text
    • http://coomargroup.com/ckfinder/userfiles/files/48609979144.pdfIn PDF document text
    • http://sapientgenerator.ru/files/userfiles/files/56405993382.pdfIn PDF document text
    • https://lawtutors.co.uk/js/ckfinder/userfiles/files/rinikezi.pdfIn PDF document text
    • http://slmj8.com/data/userfiles/files/wikuvavukutofo.pdfIn PDF document text
    • http://dwallacelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/916253590.pdfIn PDF document text
    • http://bscsaoner.in/ckfinder/userfiles/files/zekopezudoviwegibazetufin.pdfIn PDF document text
    • http://studiophotosfashion.it/userfiles/files/80725134229.pdfIn PDF document text
    • http://starma.pl/files/file/3113283054.pdfIn PDF document text
    • https://underworldgear.com/upload/users/files/xugodofoxinojeko.pdfIn PDF document text
    • https://dnm.tw/uploads/files/202109011725325813.pdfIn PDF document text
    • http://isagenixmakessense.com/ckfinder/userfiles/files/vubifateburu.pdfIn PDF document text
    • http://builderall.info/userfiles/file/bejepasujo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=india+ka+smartphone+kaun+kaun+sa+haiPDF 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_off0000c72a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC72A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF3C 20092 bytes
SHA-256: 69c10485acd6d2ab1e106b373fae4715e62be9538666365c893fadf16b6638bf
font_02_sfnt_off0001129a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1129A 10752 bytes
SHA-256: e4142274eff504448edfba14b38688502aad5e1c1df5e7bf2189cd4fc380b7c1

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