Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea5817e434e3abca…

MALICIOUS

PDF

78.5 KB Created: 2021-09-20 04:24:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f5f3b80e312b582a1574a3e744dc5dcd SHA-1: a4600a366e72b522fb75a7670c10c195f8276080 SHA-256: ea5817e434e3abca0ba50ab5d9597aed1464fe8fcb12b509c250d01eb44176a4
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The document contains numerous external URIs and links, many pointing to compromised WordPress upload directories, suggesting a tactic to distribute malicious content or redirect users to phishing sites. The presence of embedded URLs and the nature of the heuristics strongly suggest this file is part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 6

  • 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.
  • 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://infrive.ru/uplcv?utm_term=magic+voice+changer+app PDF link annotation
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/161416cb8baae1---jimebofuwogelux.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/161344278586f4---19112997368.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613204acdcca4---gugegasodepiwuzatokanej.pdfIn PDF document text
    • http://pomocnaukowa.net/Upload/file/fisiw.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/837870551220f93b4031d1b62392226d/xetojevadoko.pdfIn PDF document text
    • https://rumputhijau.com/contents/files/86811989115.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/wuxaberopebomo.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/47791433398.pdfIn PDF document text
    • https://samuelben-horin.com/userfiles/file/pojudepinokuzekil.pdfIn PDF document text
    • http://lokalsport.no/userfiles/file/50087368684.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613741359253d---xomogukegidewemige.pdfIn PDF document text
    • http://johnlillylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bosuf.pdfIn PDF document text
    • http://clingac.es/d/files/97790717093.pdfIn PDF document text
    • http://ez-surveying.com/htdocs/cljr/data/files/37597935598.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/8335ee6f68a130ba6b04b4568950190e/tomibuzirigorokuj.pdfIn PDF document text
    • http://easytravel63.ru/ckfinder/userfiles/files/zasurazovimididorodan.pdfIn PDF document text
    • http://studiogalata.it/userfiles/files/warilurirebuzofijepubadu.pdfIn PDF document text
    • http://castel.lu/userfiles/files/63465655169.pdfIn PDF document text
    • http://rotarycochinharbour.org/ci/userfiles/files/mamifoxuvevaka.pdfIn PDF document text
    • http://airmon.hu/images/files/roxagebipipiw.pdfIn PDF document text
    • http://evaemlak.com/userfiles/file///dodusodobesapajabizux.pdfIn PDF document text
    • https://orsam.org.tr/paketler/ckfinder/dosyalar/files/68386697216.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/dl61i55i5a3mfismmvuio6rbsr/46005696279.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_off0000c8e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e0f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F2 20088 bytes
SHA-256: deb703eb9a1ed3a9aa89af10c196579d7db3ff773fdee13cd3bc16bec6100c62
font_02_sfnt_off00011569.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11569 10400 bytes
SHA-256: d3e2120eb207d40c5cbbf674c489040b3c49daf73a785aad83aa773595532fbd

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