Malicious PDF — malware analysis report

Static analysis result for SHA-256 69ed61c94255fdc4…

MALICIOUS

PDF

75.7 KB Created: 2021-09-16 20:01:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 03feea05877bca5e3baf48f6db02cc5c SHA-1: 2e2f7105c5f1bed1918937704da95bbafc42eee3 SHA-256: 69ed61c94255fdc49ce0a028ccf991995c225c35677d14fe61dfa36555f74738
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 6

  • 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.
  • 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://catamma.ru/uplcv?utm_term=flutter+android+app+crashes+on+startup PDF link annotation
    • http://ofitecnic.es/files.ofitecnic/fck_up/file/rekokobebibugesidigorozor.pdfIn PDF document text
    • http://hoitruyengiaocodocvietnam.com/uploads/image/files/bosezojobuxamagemomuwaf.pdfIn PDF document text
    • https://lbk-ingatlan.hu/uploads/file/dozuwafinelojenir.pdfIn PDF document text
    • http://tovicetour.com/FileData/ckfinder/files/20210906_17211BB38493E3E7.pdfIn PDF document text
    • https://learn-atdi.com/uploads/files/13428831014.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe381cd67f---45298429891.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613be04de8c69---teterinagifegido.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/a75be310828b2059a0ccdeff32c3111f/95826809245.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/tosopif.pdfIn PDF document text
    • https://mlbcsimleague.com/ckfinder/userfiles/files/89387726014.pdfIn PDF document text
    • http://pitchdecor-construction.com/user_img/files/midutiveka.pdfIn PDF document text
    • http://chipmax.in/chipmax/ckfinder/userfiles/files/38936558562.pdfIn PDF document text
    • http://costanzolegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/puxej.pdfIn PDF document text
    • https://canoe.ro/Extras/ckfinder/userfiles/files/tegetorutagur.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/db5ea5bb57d46355c7dfbcea2e44bd7b/11859651726.pdfIn PDF document text
    • https://brothers-music.com/ckfinder/userfiles/files/noxabub.pdfIn PDF document text
    • http://dirpub.org/editor/ckfinder/userfiles/files/88699971192.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/lavujetilatenifuwedu.pdfIn PDF document text
    • http://fioredda.com/userfiles/files/bonerexizovigeda.pdfIn PDF document text
    • http://stroyindustry.com/userfiles/file/74519782877.pdfIn PDF document text
    • http://avandcie-automation.fr/ckfinder/userfiles/files/16170079372.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/bewijogixebozowipalifujos.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/57967268981.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/0f6dd2bdea5418e8c2fbd4c32e3c4f53/gujexijag.pdfIn PDF document text
    • http://zhouzhuanx.com/v15/Upload/file/2021912230136465.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613efce8d0681---nixepetozegibigo.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_off0000c565.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC565 10688 bytes
SHA-256: 1107558a4ee96b251d649623dea2bdbd8ab1b3554cf404130521f4a457950b6e
font_01_sfnt_off0000ddbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDBE 16644 bytes
SHA-256: 2b3f45adcf704932bb7ced12eb4d3c3c39ee8837cb9255cb629107b67b3098b8
font_02_sfnt_off0001094f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1094F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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