Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e46fbae3ae6f44f…

MALICIOUS

PDF

70.5 KB Created: 2021-09-04 14:52:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6ddb8dd1d32b5b92c18841cdd5523883 SHA-1: 854a35afe1fe05d520e45f5a94507d8444481a68 SHA-256: 4e46fbae3ae6f44f2bd21e6287adc1d8df72d0076e50669345371048281de326
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains an embedded JavaScript stream and a large number of external URIs, many of which point to compromised WordPress sites or disposable domains. The heuristics indicate a link farm designed to distribute malicious PDFs, likely for phishing or malware delivery. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://synerhu.ru/uplcv?utm_term=ncert+class+12+biology+textbook+pdf PDF link annotation
    • http://detikakdeti.ru/img/file/lewazakuruwujizaporule.pdfIn PDF document text
    • https://armenia4d.com/contents/files/jigopupoxas.pdfIn PDF document text
    • http://webdulich.com/js/ckfinder/userfiles/files/84843692273.pdfIn PDF document text
    • http://thesecurityguardunion.ca/userfiles/files/reduwaxupeku.pdfIn PDF document text
    • http://prinsart.ro/uploads/files/vixerajujedelejanu.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f7383f9592a---redirenonogukimevuje.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16075f1644d04b---64553156595.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc9ee99515---91688855066.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/4a37348c756c3e65290120accae1df4b/8227910773.pdfIn PDF document text
    • http://agrobud.net/uploaded/file/sasumebuwakomivawudagul.pdfIn PDF document text
    • http://phayaotechno.com/UserFiles/File/73882992209.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160effbd65224c---fimaxubitul.pdfIn PDF document text
    • http://regcureguide.com/files/files/nawezewimululi.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/72272861201.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a3abec05067---rivaludibodemejitonizap.pdfIn PDF document text
    • http://superpart.com/files/kejuwosavugegolokofonuxel.pdfIn PDF document text
    • http://greatnice.club/updatefiles/file/dufonutogonekeg.pdfIn PDF document text
    • http://yishiweb.com/upfiles/files/20210828_142445.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e7883257a6b---78733720407.pdfIn PDF document text
    • https://eamenfaraz.com/cache/fck_files/file/71746511536.pdfIn PDF document text
    • http://flagrant-desir.com/userfiles/file/wozolonadisowaj.pdfIn PDF document text
    • http://transcash.com/ci/userfiles/files/76177973547.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_off0000b39d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB39D 15216 bytes
SHA-256: 5aa94a08db76c2e52f13adf11d51d00c2ac714695da04a286d65278282ecba75
font_01_sfnt_off0000da0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f222.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF222 11288 bytes
SHA-256: 6d6f02cb7d3bee34fdeed80d89083d0833b84add6d21f68fb3442767e193c956

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