Malicious PDF — malware analysis report

Static analysis result for SHA-256 789a6442ea8a4884…

MALICIOUS

PDF

84.4 KB Created: 2021-09-03 13:50:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 19b37c221d03546b41af5c388ffcebed SHA-1: e0e2ad6a194c65c3aa17c029f5e326919316719a SHA-256: 789a6442ea8a4884220cca9f2a30206292e9ccd6d29bb949f2c4a198cb6a6467
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous external URIs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates the attack by hosting these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • 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.
  • 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://drafthe.ru/uplcv?utm_term=manfrotto+mt190xpro3+manual PDF link annotation
    • http://yangs-ns.com/ckfinder/userfiles/files/20210702145810.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/7a611317e5g9o5dii8d2bri3j6/figobalivubujotipatob.pdfIn PDF document text
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/35344134056.pdfIn PDF document text
    • http://gdgom.com/upload/file/2107021333328077168dnzczjyzjkx.pdfIn PDF document text
    • https://ikuseikyokai.jp/ckmedia//files/xobapebakap.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/041253b8230ff6d90fbaec3b785459ae/18541575986.pdfIn PDF document text
    • http://southwest66reunion.com/clients/f/f6/f6f8b7bd17d60304c359e527a2c43449/File/jifikubajovejane.pdfIn PDF document text
    • http://skonasystems.com/userfiles/file/37395811825.pdfIn PDF document text
    • https://www.corpeverest.com/ckfinder/userfiles/files/5285561259.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608c308d645b3---22487759911.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/31187257891.pdfIn PDF document text
    • http://iringmalaysia.com/ckfinder/userfiles/files/49195678746.pdfIn PDF document text
    • http://identik.hu/editor_up/ritomodonaxemamebogimuku.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160986ba841b55---11676060599.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16084d22d66fb7---bojeziwiw.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/854067a312d2939c2f0e1816d2af30bd/72824308948.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/fa62ac76d8bb3fd5fe6bc4cad7e6ce23/11142358533.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c66a16d5933---38260309047.pdfIn PDF document text
    • https://gulfb2b.com/userfiles/file/38309590899.pdfIn PDF document text
    • http://zaintik.org/files/galeria/files/3935202575.pdfIn PDF document text
    • https://mwasafat.com/uploads/files/10753162018.pdfIn PDF document text
    • http://ranahytta.com/ckfinder/userfiles/files/80209969098.pdfIn PDF document text
    • https://pemaboutiquehotel.com/assets/userfiles/files/63805152571.pdfIn PDF document text
    • http://185.33.116.145/~acus01/upload/files/wivufidagam.pdfPDF 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_off0000de62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE62 19868 bytes
SHA-256: 6465a5ca39740df23de236fb9465b12cf378090275196db6e6a8d6f317462cb6
font_01_sfnt_off00011309.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11309 10836 bytes
SHA-256: 95fb2e149ab984694355b47e4082089bde29bff45eaf396950979eb1a42b1e10
font_02_sfnt_off00012c1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1