Malicious PDF — malware analysis report

Static analysis result for SHA-256 102c3f0b205f788f…

MALICIOUS

PDF

97.4 KB Created: 2021-08-08 14:16:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: a9d89fc7c05d6172bdab8ad9b666e425 SHA-1: db7b71805b49ff0a9b75611ee74a15b74c677f9d SHA-256: 102c3f0b205f788f9911f676b92c1ac93665cd9a506eee4925d842f2356e6e58
164 Risk Score

Malware Insights

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

The sample was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous links to external websites, many of which are hosted on compromised WordPress installations. These links likely serve as lures for phishing or to download further malicious content.

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
  • 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://crewmak.ru/uplcv?utm_term=3+phase+half+wave+uncontrolled+rectifier PDF link annotation
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ffe342e921---zarivujapipovaxo.pdfIn PDF document text
    • http://burragebrothers.org/demo/jolie/beta/userfiles/files/65857644714.pdfIn PDF document text
    • http://studiorumeo.it/userfiles/files/bozatotilalagomewudinemum.pdfIn PDF document text
    • https://corumosmanlimakina.com/js/ckfinder/userfiles/files/mosidojipolufamexido.pdfIn PDF document text
    • https://stvorki.ru/files/file/40358150636.pdfIn PDF document text
    • http://charontrade.hu/data/file/jesodipuri.pdfIn PDF document text
    • https://actsonics.com/uploads//files/202108021945056222.pdfIn PDF document text
    • http://rialta.ie/userfiles/files/84014898033.pdfIn PDF document text
    • http://www.abcklima.hu//data/editorfile/janin.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/wupawi.pdfIn PDF document text
    • https://sfasg.jp/js/ckfinder/userfiles/files/71925898870.pdfIn PDF document text
    • http://riversedgefm.com/files/file/jirilubuwovurizugemubi.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/ij15eo7hp2hbptqgmulginbu36/29271763109.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160875befe1ef5---gopetewebufuzonafipetuked.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608f080895754---42489682075.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/73248844104.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/xegifujifevusowavi.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/b4155607dee247c233104bc68ed454c1/31214531686.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/nuzuvijigu.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc78d30fe2d---66859400721.pdfIn PDF document text
    • http://antansconstructions.com/ckfinder/userfiles/files/pemufesesoduwoz.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/36459491625.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16071aa0716433---50547477174.pdfIn PDF document text
    • http://gocreate.termall.pl/upload/fck/file/zojegig.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/ravepelemekilajedegejat.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE56 16088 bytes
SHA-256: 450eea5fc67953cc3bdc764260aa6f1739571c17331c9588074966c3dbef4c6c
font_01_sfnt_off0001138b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1138B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ba2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BA2 11044 bytes
SHA-256: b78289217b534a24190763dd3659b77f4829636dfaca2b1cd7d9eea2b6f62087
font_03_sfnt_off00014554.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14554 18520 bytes
SHA-256: 016f228327854262033e03d3db8007709f23391c0c186bce86f6a49b708d125b