Malicious PDF — malware analysis report

Static analysis result for SHA-256 15f0e5994aa32d2e…

MALICIOUS

PDF

105.7 KB Created: 2021-09-01 02:54:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 177433dcbe116010ec8dce1402a9244d SHA-1: 2b5563161dea4cc6a295b23aa9a6786ccb43f625 SHA-256: 15f0e5994aa32d2ee867458f5f2704151fc1dae1782ede5ffb3e353b0d1f02af
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains embedded JavaScript and a link farm pointing to numerous distinct hosts, many of which appear to be compromised WordPress sites or disposable domains. The embedded JavaScript likely facilitates the redirection or further payload delivery, contributing to the phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://augsburger-dartliga.de/uploads/file/46501679112.pdf In PDF document text
    • http://kirakuramenandsushi.com/uploads/files/34713288609.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/0acdcfb60dd437e70397c3e886daef7d/xizixofaro.pdfIn PDF document text
    • http://dienlanhhuubinh.com/upload/files/jopulodadolefo.pdfIn PDF document text
    • http://feuerwehrobrigheim.de/upload/files/51438869948.pdfIn PDF document text
    • http://ciaooo.ru/uploades/userfiles/file/18639427944.pdfIn PDF document text
    • https://nhaccugiare24h.com/uploads/userfiles/file/53309809361.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/af0bd33892a7fc4cc2569759ed86713e/pelutapoxalu.pdfIn PDF document text
    • http://homelife-superstars.com/image/files/bixoledi.pdfIn PDF document text
    • http://campbellelectronics.com/uploads/kufazotibu.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/fdda8b6e9769ae8407a089a323d98fd3/sudov.pdfIn PDF document text
    • https://yuktogel.com/contents//files/42423696804.pdfIn PDF document text
    • http://dkkarsin.pl/img/upload/files/10193445364.pdfIn PDF document text
    • http://sunnysolutions.it/uploads/assets/file/wonigitapubuf.pdfIn PDF document text
    • http://ukicda.com/admin/fckeditor_upfiles/file/2021082520595680554.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/341fdde1646f83a8ee063cef1afc9dad/94812391446.pdfIn PDF document text
    • http://herfon-machinery.com/images/ckfinder/files/20210807101151.pdfIn PDF document text
    • https://www.sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/xejonutupaf.pdfIn PDF document text
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d88b22e081---97004729465.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/c0gvm3pa09hsb39bfs0qq5bkdt/2496708020.pdfIn PDF document text
    • http://thedreams.cz/files/61613212729.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/27399741f2d125ce9da9b38a7b8e6af3/lediwapizuvuzigutagurovup.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acfd1381853---xawuruvogonukosogojuso.pdfIn PDF document text
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/79983072589.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=the+epistles+of+jesus+christ+and+abgarus+king+of+edessaPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000114f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114F2 21704 bytes
SHA-256: 1ef385dc52aff5ab0e608ee70976de391d98cad33ad237330452b7f425fcd68a
font_01_sfnt_off00014d53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D53 11324 bytes
SHA-256: bfbd796efc37a14a032febd712e1c8f79e172d7fe16d76ee2648c9f13f0e00b5
font_02_sfnt_off0001677f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1677F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00017f90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17F90 16340 bytes
SHA-256: c64c2829c4d657061a68d74b21000998756f01f2995f0c2fb8dee916b85b3acb

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