Malicious PDF — malware analysis report

Static analysis result for SHA-256 a359c1c19e6c5b1a…

MALICIOUS

PDF

69.3 KB Created: 2021-09-28 11:08:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 90b2834ac92c6f0e0de62e07babe7504 SHA-1: 96ea663cff7f36b3b3d7483da2a9649df7f5e063 SHA-256: a359c1c19e6c5b1a262fe919b934f2d2050159ece93b07b1aa2a4066ef864c4e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The presence of embedded JavaScript and a high number of external URLs, including those hosted on compromised CMS platforms, strongly indicates a malicious intent to redirect users. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment, suggesting the document is part of a phishing campaign or serves as a dropper for further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://synerhu.ru/uplcv?utm_term=guess+the+anime+emoji+answers PDF link annotation
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/7dfdc248ed3d9e2201b03244cdf4a737/kajonorexuwinu.pdfIn PDF document text
    • http://kkc1.org/htdocs/cljr/data/files/31303823548.pdfIn PDF document text
    • http://mackyz7automotive.com/js/upload/files/43454997273.pdfIn PDF document text
    • https://akproauto.net/nbloom/fckuploads/file/14186671008.pdfIn PDF document text
    • http://ambulatorioveterinarioilprato.eu/userfiles/files/xenibefemugotofikefugese.pdfIn PDF document text
    • http://aardbeienfeesten.nl/uploadimages/files/papenafuwatasunakoruzor.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144eb130941b---91619769957.pdfIn PDF document text
    • https://angkaganjil.com/contents/files/dopewovexumevokekukej.pdfIn PDF document text
    • http://shinyoungvalve.com/userData/board/file/87705403427.pdfIn PDF document text
    • https://fallsplat.se/bildbank/file/vimovanutefivazeda.pdfIn PDF document text
    • https://beldapromosyon.com/calisma2/files/uploads/wilunebiro.pdfIn PDF document text
    • http://synergyproperty.com/images/files/marejazuxuzuvunuxoguwof.pdfIn PDF document text
    • http://m-s-g.ru/userfiles/files/bimiganavizuxiz.pdfIn PDF document text
    • http://stattus.com/assets/file/kafotono.pdfIn PDF document text
    • http://cycling-software.com/files/file/4055991169.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/e8b877b52c697be6dd0cf81e07f862d1/214340800.pdfIn PDF document text
    • https://tidaksusah.com/contents/files/27168383223.pdfIn PDF document text
    • https://tadimtursu.com/image/files/35582741828.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161427c3174490---24730708580.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/93945992932.pdfIn PDF document text
    • https://globalybm.com/ckfinder/userfiles/files/1631491253.pdfIn PDF document text
    • http://teakdeck.pl/files/file/jimafadase.pdfIn PDF document text
    • https://vespaclubcagliari.com/userfiles/file/83194403466.pdfIn PDF document text
    • http://medrea.ru/upload/files/labulipavosij.pdfIn PDF document text
    • http://sissonne.hu/editor_up/tuwetibigoz.pdfIn PDF document text
    • http://geo-equipe.it/userfiles/files/gimizusuganiloxakuxixix.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_off0000b066.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB066 10684 bytes
SHA-256: 8906a8233f7d530a1fcfc0051db8be77c6b060dc86b6e1b2d965380893f33e9e
font_01_sfnt_off0000c8c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e0d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D5 14848 bytes
SHA-256: ea2a3749f7212ff52fbdf18b1a7799dc2edfde69358f4462284a4de905b65f49

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