Malicious PDF — malware analysis report

Static analysis result for SHA-256 f99b09b9d81b3882…

MALICIOUS

PDF

109.3 KB Created: 2021-08-01 17:58:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-14
MD5: e54bd35c0d8fb7c4ed46a27b194c0818 SHA-1: 05336278c124e8a0f258d1b9a20695201e6d67eb SHA-256: f99b09b9d81b3882c3b84be7eec755cfdc1d38496f6b7650d7164f2e53e1c918
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting an attempt to distribute malicious content or phish for information. The ClamAV detection and ML classifier strongly indicate malicious intent, likely involving the execution of JavaScript to download further payloads or redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://smidgel.ru/uplcv?utm_term=antrenmanlarla+paragraf+pdf+indir PDF link annotation
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/ths1gr8hbk1ivm4101702vl0su/xewifovopeforisotako.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4fed35ec4---3148288259.pdfIn PDF document text
    • http://fittbike.hu/files/file/40520187868.pdfIn PDF document text
    • http://www.minaakshimajumdar.com/fckimages/file/61106092306.pdfIn PDF document text
    • http://www.niziointerior.pl/upload/file/nuwap.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4cb33fade---54673964281.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/83352747515.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607581a3814a8---tamemizikixewuxos.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/n0lt1ofejvdp3duddqieu7gih4/46321730552.pdfIn PDF document text
    • https://digireg.cn/upload/64420562604.pdfIn PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/gasoniritusugutisabesi.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/f807b34693ec653bc937f67d567b4b96/jilazijilufamoboj.pdfIn PDF document text
    • http://carshopm.com/js/upload/files/4179760237.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/8446a12a6ae70e4018631d8decb1de61/wusujowuviwikux.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082990581255---bibanuluzogonosan.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/69903565653.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/15ccoc0pksqketn267m0gogm7v/28440504338.pdfIn PDF document text
    • http://serdceprirody.ru/userfiles/file/67416694049.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/1497714848.pdfIn PDF document text
    • https://alkathirilaw.com/userfiles/files/tixofaruzomugexamuvitu.pdfIn PDF document text
    • https://mimpisiluman.com/contents//files/fafex.pdfIn PDF document text
    • https://sherwoodchamber.org/ckfinder/userfiles/files/zuzuduberolasizemagebinu.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160768cf28fa49---remasumemokedokosezaxozu.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_off00013a51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A51 10532 bytes
SHA-256: 8428190f1c8bd46342fa04e8fc49cf4d428d13a4c32a494fefa194f0524a8530
font_01_sfnt_off0001520e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1520E 24836 bytes
SHA-256: 234d67ff3845f76bea4fcfb00a1df1f606bb076174ec21796ab57a4431d797af
font_02_sfnt_off00018d6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18D6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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