Malicious PDF — malware analysis report

Static analysis result for SHA-256 5eeb1776ecf1a2a6…

MALICIOUS

PDF

79.3 KB Created: 2021-09-13 22:55:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 12fc947dbc9e872343f277df281d16cc SHA-1: 885dd5c8dfe0d24e3e07e2cb73da68b3a4765853 SHA-256: 5eeb1776ecf1a2a66676a4bb0ea28a563cb3102064c2254879986fb7b866a45e
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a high number of embedded links pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of numerous external URIs suggests an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 https://synerhu.ru/uplcv?utm_term=stb+emu+on+firestick+4k PDF link annotation
    • http://golfvillageonline.com/userfiles/file/zuwedazeribimejaxas.pdfIn PDF document text
    • https://promtour-rural.ro/userfiles/file/64254482782.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161399bb12efec---jivanobafu.pdfIn PDF document text
    • http://maschimaurizio.it/userfiles/files/sakuselexosirebig.pdfIn PDF document text
    • http://botaierpharm.com/upload/files/xunejij.pdfIn PDF document text
    • https://jancsoalapitvany.hu/ckfinder/userfiles/files/45289434182.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/87051503731.pdfIn PDF document text
    • http://highlevel.pl/userfiles/file/tobirolotoloxogojadiwig.pdfIn PDF document text
    • http://futsalcb.cz/picture/vtextu/file/xovokalawifuguvibuperelo.pdfIn PDF document text
    • http://appextskihjthj.handysociality.com/upload/files/vokusatofotefokirubani.pdfIn PDF document text
    • http://adamslakeband.org/userfiles/file/12465525109.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/i2r06cc5kdn4de9mq0sfqjpri6/gerurixogitukiv.pdfIn PDF document text
    • http://kerekesvillszer.hu/UserFiles/file/11218146107.pdfIn PDF document text
    • http://bortran.com/upload/image/file/20210912035612.pdfIn PDF document text
    • http://wwa.bdbabymart.com/app/webroot/ckfinder/userfiles/files/legasavek.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/jenabafav.pdfIn PDF document text
    • http://bridgeonlaw.com/filespath/files/20210910100617.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/vanexejigamed.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/2781909938.pdfIn PDF document text
    • http://phongthuyphatloc.com/luutru/files/fomevotibujajosotuw.pdfIn PDF document text
    • https://tlkingatlan.hu/kepek/other/file/19556549620.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/16136dabe2d259---3608595963.pdfIn PDF document text
    • http://vaness-sens.fr/ckfinder/userfiles/files/54017799482.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_off0000cf2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF2F 18168 bytes
SHA-256: a31f8223fb5d342640c4f212e61db9fd19c7f3353c99596dacfe41aecb5bd063
font_01_sfnt_off0000ff22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011739.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11739 10772 bytes
SHA-256: 01b9bef4c064bf1b6016a2580af3b9388e6d0858d1d6ab2237fdbe0984c1bb7e

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