Malicious PDF — malware analysis report

Static analysis result for SHA-256 42c1d3c40c230026…

MALICIOUS

PDF

85.5 KB Created: 2021-07-04 10:45:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: bc781ead2162e8746873562ee4f166ba SHA-1: 40cfa78c4318fe37f059faed2a46758d5975983d SHA-256: 42c1d3c40c230026a177ba3ffe52ba1f8f9a5db76d3c6d3c2a4413d880d391ed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to disposable hosting or compromised CMS uploads, indicative of a link farm designed to host or redirect to malicious content. ClamAV detection and ML classification strongly suggest malicious intent, likely phishing or malware delivery. The presence of multiple external URIs and link farm heuristics points towards an attempt to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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://lnianemarzenie.pl/userfiles/file/jomopig.pdf In PDF document text
    • http://trendybiz.in/usersfiles/file/54396838774.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/4547712466.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/mc8136b9pijnfk2a5oshrgdcre/puvasokumonez.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/pubutazezilatukefuduguso.pdfIn PDF document text
    • https://btsmstlucia.com/atomicsteps/upload/userfiles/file/65673380843.pdfIn PDF document text
    • https://vigiweb.cl/dinamicos/files/file/43161264630.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/16084a0c19171c---4033741142.pdfIn PDF document text
    • http://mauchlineware.com/html/chapelstreet/web/userfiles/files/zupofile.pdfIn PDF document text
    • https://keluargamimpi2.com/contents//files/21410591193.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/ab1a6a5a8246b54bacd9e412fdadc076/kosudenatowokip.pdfIn PDF document text
    • http://webursitet.org/Files/file/91676373482.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0545e18d0---nemijeme.pdfIn PDF document text
    • https://easy2ticket.com/upload/files/bumazupenobipi.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/e5538ju35rmb7s84ac10ci4cm8/51173590726.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d868eadb98f---nokokegivogetajizoradepi.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/e0302464ef467c0ae2096cdb49cc3f89/nopiwon.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609882b97cd20---mowulav.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/b484faf4a0e6684a156c93d600d7614b/vamitiz.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1d69106c8---78725741071.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/fimagexebofipurirewuduvuk.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/fikoxutamerubanivusa.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/41783181165.pdfIn PDF document text
    • http://ylpcl.com/ckfinder/userfiles/files/67707630765.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1609c310c121c8---zonedaxuraloloxufiwoba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=being+very+forgetfulPDF 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_off0000eec1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000106d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D3 16356 bytes
SHA-256: 0a4209d72ccf71dee7e9bdb76e0447549deef3f2529b5e8f9a551e489bf07a6e
font_02_sfnt_off00013123.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13123 10392 bytes
SHA-256: 88578c6078fcd46fb8b061c552cec87b7b32adc58e6100bc04f3d7be1bae9ffd