Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbd94d62eed4d25f…

MALICIOUS

PDF

72.8 KB Created: 2021-09-03 11:32:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 334b4f738a61ba764d902d78fe24508a SHA-1: 4a47fa6e943b0992b2caa14bfde7621e55f46062 SHA-256: dbd94d62eed4d25fba31858bbb3dd983b0d1a4200abd5857162e05fbb1f8ccd9
184 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable hosting. The presence of embedded JavaScript and the high number of external links suggest an attempt to redirect the user to malicious sites, likely for phishing or to download further malware. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://inwebjor.ru/uplcv?utm_term=finding+gcf+worksheet+grade+4 PDF link annotation
    • http://e-hematologica.pl/users/file/gidudufepurumubotowivilak.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a77d977e594---97629619495.pdfIn PDF document text
    • https://hijaulumut.com/contents/files/49168424955.pdfIn PDF document text
    • https://tonmathunglan.vn/upload/files/dawili.pdfIn PDF document text
    • http://mawaevents.com/uploads/file/pitob.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/1c322eaf72e72b4abd5659c81c48470c/2901270436.pdfIn PDF document text
    • http://127.0.0.1/bantraicay/js/ckfinder/userfiles/files/2434142882.pdfPDF link annotation
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/709b7dcf012aea978d472ac89736f068/zalavepigepibibiwejafu.pdfIn PDF document text
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/tomujovojibamirufelubelo.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c222355018f---vunivugafukubesegidu.pdfIn PDF document text
    • https://nistd.in/userfiles/file/811569500.pdfIn PDF document text
    • http://dj-maily.com/uploads/pages/files/wowifeparomajogaloruwi.pdfIn PDF document text
    • http://abwlanham.com/uploads/files/11691983608.pdfIn PDF document text
    • http://patrick-vallot.com/upload/files/90135147592.pdfIn PDF document text
    • https://termokingbt.com/ckfinder/userfiles/files/barikuxineja.pdfIn PDF document text
    • https://servauto.fr/img/user/file/33667919993.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/zudiz.pdfIn PDF document text
    • https://www.stnedu.com/ckfinder/upload/files/nakevaxapumekazotaji.pdfIn PDF document text
    • https://www.agro-zavod.ru/app/webroot/js/ckfinder/userfiles/files/difarij.pdfIn PDF document text
    • http://isystemlab.com/admin/ckfinder/userfiles/files/49490079453.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_off0000b28a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB28A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000caa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAA1 10940 bytes
SHA-256: c52dca0840d6284af3648cf1365213bbdb7fece0dc92eef372c44ecf3b4ebbf9
font_02_sfnt_off0000e3d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D5 19764 bytes
SHA-256: c2d2441ceae677a726d6c3461d1f6fbcf40c466a94f307e9e5c0d1667b51685c

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