Malicious PDF — malware analysis report

Static analysis result for SHA-256 991e1f98b2b11983…

MALICIOUS

PDF

91.3 KB Created: 2021-08-11 20:54:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a720aa5992baa7becd834a1663401040 SHA-1: 7d21407636383a85b6af7a64e50ef37beeca112e SHA-256: 991e1f98b2b11983646da232c13c1b4616caaa7296b01b2c18f556eea9d84572
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, indicating it is likely a phishing or malware distribution lure. The document contains numerous external URIs and links to compromised WordPress upload storage, suggesting it functions as a link farm to direct users to malicious content. No scripts were extracted, but the presence of numerous external links strongly suggests a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://synerhu.ru/uplcv?utm_term=lecciones+preliminares+de+filosofia+resumen+leccion+13 PDF link annotation
    • https://mavibusiness.it/file/82689675582.pdfIn PDF document text
    • http://daindnc.com/fckeditor/userfiles/file/degavopasofuw.pdfIn PDF document text
    • http://velo.hu/UserFiles//file/jevemisuja.pdfIn PDF document text
    • https://sunsoftinfoway.net/ckfinder/userfiles/files/wepagezejugerex.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160af6c5fe76a1---pejigizumawonisasunufu.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3ea71b24bb---puwowuzapas.pdfIn PDF document text
    • https://qfuse.it/images/uploaded_files/ckfinder/files/1626631389_f8b4233318.pdfIn PDF document text
    • https://cursosgratuitosonline.es/wp-content/plugins/super-forms/uploads/php/files/drcice793k8e9r09ofa2r1s2gu/gaxoxabewabepesab.pdfIn PDF document text
    • http://residencecarlofelice.com/userfiles/files/nolejidirawopused.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee49b4928db---kametaxiregizufavixoseno.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/ffc37f4d1f31e1b370f3d1b23522298b/86340688444.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/fekogezoxomururuti.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/59619e9296908dd053592fb959da4654/34028323731.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f136b921c86---61346446262.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/2198d792e25585ba1b62e76362f97ca9/natejubemuxo.pdfIn PDF document text
    • http://zerosquareonline.com/file/48334243857.pdfIn PDF document text
    • http://rolmech-strzelno.pl/Upload/file/zivijagisutowogukugupuku.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160977f105922f---4128462715.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d873b983047---25130946872.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/cdca6e841f1edaec15fc1b09ff9a2ad4/mitinuvebelilamexaz.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/j4hc5i5ivdikbrjpdoknvl1dp8/geliwojobopow.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/cec51c950b1c2c1d24d8173d5f7a8d02/43379271092.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d0128345f---megixoxuzafil.pdfIn PDF document text
    • https://garyjetcenter.com/wp-content/plugins/super-forms/uploads/php/files/d9f0fc4ddd26ffce1ef36adefbf901d5/80660804880.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_off0000fc3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC3C 18192 bytes
SHA-256: ad4b587f9307bb4317e75705a41ca688fc3e9adb8ed72e8a36d51c203fbdf898
font_01_sfnt_off00012a72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A72 10964 bytes
SHA-256: 5c836816c803446cdcb576d4218388270d6141b1fc10ceadd987874fb9f9937a
font_02_sfnt_off000143e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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