Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4bafb85a9ef8952…

MALICIOUS

PDF

90.4 KB Created: 2021-09-23 03:33:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a43c8b59aa7f2d74aef6181a801904b3 SHA-1: af006c148dbe1a5b7505d324dd8f89fa0b263317 SHA-256: b4bafb85a9ef89525c74624fe6e299ee4d4fa84fb809660e0d8f299381e0d3a8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' suggests links to compromised WordPress upload storage. These findings strongly suggest the PDF is designed to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://smidgel.ru/uplcv?utm_term=words+with+friends+cheat+apk PDF link annotation
    • http://www.thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/69321597544.pdfIn PDF document text
    • http://ippinnudon.com/uploads/files/xodatuduzulavefikug.pdfIn PDF document text
    • https://consurs.ro/ckfinder/userfiles/files/negimuzani.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/60374257332.pdfIn PDF document text
    • http://studiobardinisrl.com/userfiles/files/28930565763.pdfIn PDF document text
    • http://svatba-emi.com/uploads/pages/files/36812193779.pdfIn PDF document text
    • https://aarhuskortet.dk/images/file/resiluxoxelowadade.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1612f478acc2a2---bosadufatag.pdfIn PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/72527524941.pdfIn PDF document text
    • http://hondaototanan.com/upload/files/95040351420.pdfIn PDF document text
    • http://solar-makernavi.com/ckfinder/userfiles/files/tenaduba.pdfIn PDF document text
    • http://daithanhnam.com/upload/files/46270959499.pdfIn PDF document text
    • http://lodzkiespotkaniateatralne.pl/userfiles/file/38994387682.pdfIn PDF document text
    • http://marketypik.pl/zdjecia/fck/file/23674650168.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613996b8c3210---vupobafodez.pdfIn PDF document text
    • https://people11people.com/uploads/File/mozaw.pdfIn PDF document text
    • http://rutka.pl/media/upload/files/f606bbabcc418d11cb6cc671346687a0.pdfIn PDF document text
    • http://leton.pl/userfiles/file/24515794614.pdfIn PDF document text
    • https://hopadive.cz/ckfinder/userfiles/files/74722837021.pdfIn PDF document text
    • https://intrastorg.com/userfiles/file/4302365600.pdfIn PDF document text
    • http://xn--tnqz8hz5cb8l.com/upload/files/taruzozufoduwapefikofuti.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613e8a8a83103---64896804766.pdfIn PDF document text
    • https://www.thc.gda.pl/ckfinder/userfiles/files/xevupe.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_off0000fa02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA02 18900 bytes
SHA-256: 476959de85ea8d3d0bb00ba6391fc4dc44d1b91377df107379067b6193477fd0
font_01_sfnt_off00012b48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B48 10844 bytes
SHA-256: 3eb497b116ea318c93cf1f0859f31cfb0853fca5756e97718233ddcfcdb52d5d
font_02_sfnt_off0001445b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1445B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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