Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cb39ec1dce3bddb…

MALICIOUS

PDF

69.2 KB Created: 2021-10-04 01:12:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: a43ccb0f3d3f56f6d17576473eec934e SHA-1: 555ed9e4baefd6b60d840da109b47eb7bfc4e682 SHA-256: 8cb39ec1dce3bddbcf3b9c05bbb3055b4b5a00776ab998c246eebdf970e500d8
176 Risk Score

Malware Insights

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

This PDF document is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains a large number of external links, many pointing to compromised CMS upload directories, suggesting an attempt to redirect users to malicious content. The PDF_IMAGE_LURE heuristic indicates it's likely an image-based document designed to trick users into clicking through to a potentially harmful URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/161567e4d921fc---16224227176.pdf In PDF document text
    • https://harkakotony.hu/UserFiles/file/71940791926.pdfIn PDF document text
    • http://ticketsperiodico.com/galeria/files/4110555678.pdfIn PDF document text
    • https://ontogepszerviz.hu/editor_up/pibeziwovogarolovet.pdfIn PDF document text
    • http://simp-q.ru/userfiles/file/49213216176.pdfIn PDF document text
    • https://stephankeppel.com/userfiles/file/zuposilamob.pdfIn PDF document text
    • http://chpcentre.com/files/file/14041231953.pdfIn PDF document text
    • http://cpils.com/userfiles/file/nuneredut.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137cfdb20406---gokotoguzexuvujuwu.pdfIn PDF document text
    • https://citronel.com/userfiles/files/43021676258.pdfIn PDF document text
    • https://biharlokmanch.org/userfiles/file/2305791928.pdfIn PDF document text
    • http://onlinemidias.com/ckfinder/userfiles/files/26648608761.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/fba5a95780bbbf3e4c7bc96526d7baac/82583687490.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/25491436362.pdfIn PDF document text
    • http://avrig35.ro/uploads/fck_editor/file/sulemaledaneduwa.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16150c42adf156---sidekugiwiwidikituket.pdfIn PDF document text
    • http://labsshop.com/d/files/29034507153.pdfIn PDF document text
    • https://people11people.com/uploads/File/tojaluduwiw.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/161502ea047144---wabububomojorod.pdfIn PDF document text
    • http://portakalweb.net/home/portakal/public_html/ckfinder/userfiles/files/27615770988.pdfIn PDF document text
    • http://cheliabinsk.realxenon.ru/uploads/files/90648475547.pdfIn PDF document text
    • http://www.fashiongale.ro/userfiles/files/59828599815.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/84329324620.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=slow+dance+songs+from+the+80sPDF 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_off0000b131.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB131 14136 bytes
SHA-256: 05629d4fa66eae47d62cd99a7457411178cee4ee20e54dbcbc20b98bd641e963
font_01_sfnt_off0000d45c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD45C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ec73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC73 11324 bytes
SHA-256: e131d348246ce33340afce590f1e608f8869056b92d05180826e167e49cc1aa8

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