Malicious PDF — malware analysis report

Static analysis result for SHA-256 621fe6720a423994…

MALICIOUS

PDF

89.3 KB Created: 2021-08-12 11:05:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e1397f600da68fab9c37e7a0a97995e5 SHA-1: 8bfd4397960cde28b90dc40ea9b2780697fb02e0 SHA-256: 621fe6720a423994c75eda79f4007bfe41bf155cafd2772e36ff1e277ee72f21
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm used for phishing or malware distribution. The PDF structure and embedded content are consistent with a malicious document, likely intended to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

Heuristics 6

  • 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 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://ludifrance.fr/userfiles/file/roganofokeb.pdf In PDF document text
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eca5fac853---xusewelokepigedemo.pdfIn PDF document text
    • http://anquocrealty.com/uploads/image/files/50970821833.pdfIn PDF document text
    • http://hchs1972.com/clients/2/2c/2cb73362227bcfbd3ed6ae01b5b3dc46/File/tinidorotulaniroje.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/loreparubofetizumesep.pdfIn PDF document text
    • http://vieclamquantri.net/upload/files/wobezoxupubupu.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/0eb2bb87ff70152115e754222a79dfa4/77394099310.pdfIn PDF document text
    • https://bedandbreakfastchia.it/userfiles/file/wewituwojazisa.pdfIn PDF document text
    • http://holycrossyouthministryasp.org/clients/f/fa/fa15eac34f6f8ef5a8ada011ffef1578/File/7636734613.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/b43aad7450c0074ceb614458faa235c4/badujesugeg.pdfIn PDF document text
    • http://www.adarshvidhyasankul.org/userfilesfile/92886789611.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/a69f3f7102f8b20f95b0599d6df8ca5c/rasexorobefeborutitol.pdfIn PDF document text
    • http://soepcentrale-dekeyser.be/userfiles/file/84006151187.pdfIn PDF document text
    • http://thaidicattery.com/clients/f/f7/f7b4890cfba443994123e46b8078d6bd/File/19953506929.pdfIn PDF document text
    • http://aromaonly1.com/yamituki-n/uploads/files/61255377985.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607309b9852ca---50145052329.pdfIn PDF document text
    • http://anma.pl/anma_edytor/file/fovilotazik.pdfIn PDF document text
    • https://tempegaring.com/contents//files/71055293230.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/dowadujotiwuxeruwi.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/janopeju.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/vijuv.pdfIn PDF document text
    • https://global-brand.net/userfiles/files/tunenexuzakewelo.pdfIn PDF document text
    • http://bougerpourstarlight.ca/clients/c/c6/c668404594a1c08d975ab50c7bec58f6/File/segawosawesinugu.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/6e772f5d77ccbc149e6c468c2e82580e/jipuzoguxokoj.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e938ba5844a---72198343692.pdfIn PDF document text
    • https://areicon.com/images/file/wirapikekewosak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=terraria+best+post+moon+lord+itemsPDF 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_off0000fa8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA8E 10656 bytes
SHA-256: 2cf203c5a3e98cd8e09620f56c27c2947ce6dd2d7db3d85a65b753fec04b08f0
font_01_sfnt_off000112ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ac0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AC0 17044 bytes
SHA-256: 743e5033acc4ec7d9602e72ad3a288c477962375f429d318ffc0b781c6119387

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