Malicious PDF — malware analysis report

Static analysis result for SHA-256 31c8696961a890a2…

MALICIOUS

PDF

88.0 KB Created: 2021-09-03 05:21:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 47262dc90bff52487150635a9e99ef85 SHA-1: b4a6a02e26a960d80f0f5248e1252844f2f8e57e SHA-256: 31c8696961a890a2c4eacc618c8907920bcc1dc27bf46c02fd5adf6c7db1308b
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host malicious content or redirect to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1225e45350df743c88188ba11f1bd12d/dubinaxavurotekekeku.pdf In PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/73ee2df16b82e11ade19220e49ac03ae/996267948.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/160702299df5e8---86649724859.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/kghgl6fhlq077ttn3j20gpjagu/50078655453.pdfIn PDF document text
    • http://jkbprivateiti.com/userfiles/file/61773240068.pdfIn PDF document text
    • http://fhs76reunion.com/clients/0/00/009202203981f132fd14d012a57c0fe5/File/gedonemugozan.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160afcd8a9ff62---rexarigivemosuvapalidiba.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/39306099625.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/827a88968bff6d30d2c72584d838963b/70246953927.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/xutikusoxorogomejabifujo.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/dc07f09084ea8e6530de91e72545236e/pagonupoto.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078768238652---jedutolonujuduzabi.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a39625b34ab---60910882446.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/71174d40daad4ba3f0e09fe89fa938ba/tutikamakete.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087ac5e3a9b5---mamikaw.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/dozigodusigejenit.pdfIn PDF document text
    • http://sintjorisparochie.nl/userfiles/file/bigera.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/33261618344d43d2f12a1f88aba544fb/xixifemovobevivilalokel.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021060915235340.pdfIn PDF document text
    • https://projetounificado.com/uploads/files/62569728776.pdfIn PDF document text
    • http://banphimchuot.com/userfiles/file/wabifikudonis.pdfIn PDF document text
    • https://dintek.eu/uploads/file/96170112351.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16099d3ac45031---pobenuzajakunamome.pdfIn PDF document text
    • http://ofitecnic.es/files.ofitecnic/fck_up/file/26791584880.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/rm8sf3lq68k3c5nb252pt44e73/45846122901.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=scala+exercises+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_off0000eff8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001080f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1080F 10468 bytes
SHA-256: 5fac1f1e2fff84e90b67f227b64ee0cebf89236a61d4d7ef26b521efa5ae833c
font_02_sfnt_off00011fe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FE9 19400 bytes
SHA-256: 79f9cb56069a51e429319a468dd131800ae02465aeb61f2ee71f927805829ba1

Open this report in the interactive analyzer, or submit your own file for analysis.