Malicious PDF — malware analysis report

Static analysis result for SHA-256 124383c5b9d00a2f…

MALICIOUS

PDF

85.7 KB Created: 2021-09-05 22:02:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8f45931bfd55f310fcb809b37b926f85 SHA-1: 6333c134b69d35df38ad676559ef050dbf39b7bd SHA-256: 124383c5b9d00a2fd4c9844db91f9c53b33d144c52906b4f7d3baaec295fe557
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating a phishing or trojan payload. It contains numerous links to external websites, many hosted on compromised CMS uploads, suggesting an attempt to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, further obscuring its true intent but reinforcing the malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608688758c2d7---30542164964.pdf In PDF document text
    • http://alibabashipping.com/userfiles/file/36196925081.pdfIn PDF document text
    • http://taiwan-casters.com/userfiles/file/vidoxusoxagososagawa.pdfIn PDF document text
    • http://medob.org/SITE/files/editor/file/sudesazovojovu.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/f2bc34c16675c2651385eb1fa3b679da/39904599165.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608e229fe5098---vewumudifologu.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16100f108443f6---52137241404.pdfIn PDF document text
    • https://bonafideonline.com.ar/wp-content/plugins/super-forms/uploads/php/files/dacba5bcc9ccc93617863eabb0edb77e/xupakizurosani.pdfIn PDF document text
    • http://ekopaczka.pl/imgbrama/files/39512558896.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d132fe0d5d---pegisegul.pdfIn PDF document text
    • http://talk200.com/admin/admin/uploadfiles/file/kixaziwasejefibedobaduzu.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f429582e92b---35730329843.pdfIn PDF document text
    • http://king-ber.com/UploadFiles/file/20210703015450387.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/dd29011abf5baa2aec350753b797b508/duvetatajupozivulegizokam.pdfIn PDF document text
    • https://duproject.com/uploadEditor/files/dakenuzemusajegugifu.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/68967395873.pdfIn PDF document text
    • http://halongbaycruises.org/upload/files/89317948392.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3908841f8---meviwemavu.pdfIn PDF document text
    • http://poliinc.com/upload/files/32772390435.pdfIn PDF document text
    • http://noithattamphuong.com/upload/files/voladijokurikatogodi.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16071f69b703e5---36308339948.pdfIn PDF document text
    • https://snqrsl.quebec/upload/editor/file/68212048270.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/b45f98328902bbb6438fdc0c3d9a861a/46574456244.pdfIn PDF document text
    • http://fairway.cc/images/blog//file/86271104230.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/1ea197776d0c442a3d178a4d4daf6af1/49238829370.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a782f8b121b---viruvusosev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=bpl+ration+card+form+pdf+download+haryanaPDF link annotation
    • 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_off0000e38c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE38C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fba3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA3 10840 bytes
SHA-256: c42baac7615a20948236e3fa07ab404f901a7dd696202b3bba8c21db4e68defc
font_02_sfnt_off0001148a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1148A 19728 bytes
SHA-256: e4e2773ee12820fae8d06ba4a5979b8cacf0d1534e7538ec79b0854d32144c14