Malicious PDF — malware analysis report

Static analysis result for SHA-256 d35bdc69cd9b98a9…

MALICIOUS

PDF

84.4 KB Created: 2021-07-15 20:52:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b526a1c4f8c7629069ebbc885cc72162 SHA-1: def37471542b8c6ac990dd0bcfbf2fa6f2a153bb SHA-256: d35bdc69cd9b98a9e2b20889d4454043e005ef5ee8504edcd4b04d391317f61e
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. The heuristics indicate the PDF acts as a link farm, redirecting users through multiple compromised domains to potentially malicious content. ClamAV detection and ML classification strongly suggest this PDF is malicious, likely a phishing lure or a downloader for further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://uticahighclassof78.com/clients/8/89/89c70e22fe5ad1405280b455f64975d7/File/kipixa.pdf In PDF document text
    • http://tantex.org/tantex/tantexuserfiles/file/61734320350.pdfIn PDF document text
    • https://iohrp.org/f_files/files/40018967749.pdfIn PDF document text
    • http://aias.pnu.ac.th/ckfinder/userfiles/files/35428406928.pdfIn PDF document text
    • https://q-web.ro/wp-content/plugins/super-forms/uploads/php/files/qcv086rkc5jdb9mm9g19apnpjb/ludoroxefutewivajika.pdfIn PDF document text
    • https://peilimineko.com/userfiles/file/kejafifegugirimo.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d729864a292---xuzifetegujugevadezagoba.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5479e2f285---tibikufukuzopalako.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/f41f39631ff0132bf1cbde841e40a288/99921449493.pdfIn PDF document text
    • http://carolinaboatclub.com/userfiles/file/23794812477.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/a4db3b0608c8a1b9dfe053a93cfcd129/28949551192.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/19913698482.pdfIn PDF document text
    • http://epoch-making.jp/js/upload/files/8088471910.pdfIn PDF document text
    • http://mevlanaasm.com/resimler/files/wugisaxetuxonifivukunozen.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/bisinemiboxabitufepuk.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/48191282305.pdfIn PDF document text
    • http://drapikowski.pl/uploaded/fck_files/file/4876460596.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/d7851019fc48318b164912a68510fd96/wixasodasage.pdfIn PDF document text
    • https://imad0c0.com/js/ckfinder/userfiles/files/mijinalusumoxepix.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/jukumofogifatu.pdfIn PDF document text
    • http://446888.top/userfiles/file/silajaxexiluzixemelanavid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=customised+iphone+xs+max+coverPDF 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_off0000e414.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE414 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC26 17700 bytes
SHA-256: 6115af9a95781d6044745bef9fbeb3fb1104accbd4a096083af5825027a00fcc
font_02_sfnt_off00012ad1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AD1 11032 bytes
SHA-256: e32c62f916df78a04b42317c06a497ea337a750031e7d7ac2a5ff28763ffa250

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