Malicious PDF — malware analysis report

Static analysis result for SHA-256 f708aa65a73817f7…

MALICIOUS

PDF

106.7 KB Created: 2021-05-27 16:41:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 2d878fd077fd0c58ee96a446ebc5608e SHA-1: a1fec6e815da6df186c8b1df55051457bfff1c0c SHA-256: f708aa65a73817f78fed73382a6d528f5dfce656975a320545ede0b87fb77c43
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to distribute malware. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. The document body's deceptive title, 'Mensuration 2d questions pdf in hindi', is a common lure to trick users into visiting these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://ketchas.ru/uplcv?utm_term=mensuration+2d+questions+pdf+in+hindi PDF link annotation
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad51d39172b---82963253277.pdfIn PDF document text
    • http://citra.cl/userfiles/file/naloxibokiviravinawadinib.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/27f14165db8c68adde92e0254b2567b9/tolakimebenonufinun.pdfIn PDF document text
    • https://addsfly.com/userfiles/file/rimisesawikapixo.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/vql4smm2igcbultkolhb4cqmk4/pufiwopilimeragub.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a96884270ac---vifoleladepakananokasile.pdfIn PDF document text
    • https://teenvolunteerhouston.com/wp-content/plugins/super-forms/uploads/php/files/cebeb27ab13b93f609a7164278527e15/52653722031.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/jefuxobojijupabilipitolo.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085c8bcaf8a9---3352707134.pdfIn PDF document text
    • http://extintoresorigen.com/images/editor/lopilimimewiviwerifav.pdfIn PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608100477daf2---motepe.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/u93gi8rg6gkml3gmm49gmic8vv/muwozudigebe.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac3df55256---54157895904.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/lbql31vk8dist19228vk4rkqr7/76721496881.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160773454acc8d---tumixazefakuwerukoxo.pdfIn PDF document text
    • http://berbun.com/user_img/file/rulasu.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/16071d30ae4e64---78022332148.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn 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://scripts.sil.org/OFLIn PDF document text
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000126bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126BC 5360 bytes
SHA-256: 26506b74d5ab6143c38c37c4c4ab9f5cf944f881d00ac6cc97c48deabe57f123
font_01_sfnt_off000138f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138F7 3720 bytes
SHA-256: b91f3c26f37c28538ed09035cbea6f9221827f1e30b50c452f08cc820bcc167b
font_02_sfnt_off0001445a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1445A 11112 bytes
SHA-256: a724c23d4f2c6f4cdc450d425f7db720fa0d3e099b1fb6e655f21701021b637d
font_03_sfnt_off00016a77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A77 17492 bytes
SHA-256: 3f6bf2ae14874533483740b4533e3865ea2c35d7eb282ad6b6ab7967bdf77fe0

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