Malicious PDF — malware analysis report

Static analysis result for SHA-256 85106180c968a9db…

MALICIOUS

PDF

80.1 KB Created: 2021-09-10 16:34:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4e7c3ae8d932e61c7ac9b153d7cdb914 SHA-1: d5a0b6db7baf57b24f88aed3f1579c1929b35dc2 SHA-256: 85106180c968a9db889199cbdf2d0ac4324740f36095f5821b4366e8c0878dab
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV detection for phishing and trojan activity. The document contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users to potentially harmful content. The presence of these links and the overall structure strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://queure.ru/uplcv?utm_term=the+adventures+of+an+it+leader+2016+pdf PDF link annotation
    • https://bomnuocebara.com/quangbasanpham/app/webroot/upload/image/files/9835709512.pdfIn PDF document text
    • http://choinka4x4.org/cms/files/file/69163312421.pdfIn PDF document text
    • https://pre-www.bridge-academy.com/uploaded/ckeditor/files/dinulirabumikovojonikixag.pdfIn PDF document text
    • http://vnndt.com/Images_upload/files/wodalob.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161377b5624311---14834022842.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613af67e0044b---giluzap.pdfIn PDF document text
    • https://www.esfa.bg/root/ckfinder/userfiles/files/jelojogenexatenoforul.pdfIn PDF document text
    • http://theeultimatenetworker.com/ckfinder/userfiles/files/vaperutegavit.pdfIn PDF document text
    • http://e-kva.ru/admin/ckfinder/userfiles/files/35837861915.pdfIn PDF document text
    • https://deltarents.com/upload/ckfinder/files/direnefodujaxenuzes.pdfIn PDF document text
    • http://architettoannalisatinelli.it/userfiles/files/xerorogexukeduwe.pdfIn PDF document text
    • http://progettocecinacuore.it/writable/public/userfiles/file/gosibosivuraz.pdfIn PDF document text
    • https://mariapolis.es/ckfinder/userfiles/files/37750605264.pdfIn PDF document text
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/tezodawimemanameruxelaj.pdfIn PDF document text
    • https://newtech-utm.pl/userfiles/file/xijewa.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/12163583410.pdfIn PDF document text
    • https://jooli.ru/ckfinder/userfiles/files/vinepobubivodi.pdfIn PDF document text
    • http://coiffurenais.com/userfiles/file/pesalolusixamexexugax.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/qqagr44trvcpsirn4d6vlq0qi4/15319788825.pdfIn PDF document text
    • https://habrit.tw/ckfinder/userfiles/files/xekobojojolovolunuxif.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed7ad2148b---korojujiwu.pdfIn PDF document text
    • http://er-trans.com/img/produkty/files/65104563618.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_off0000cf77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e789.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE789 18660 bytes
SHA-256: fcde75876a2857a7460d8c75e53c0fbe0410a15ed004b0fab892a7bdbc9a4d6d
font_02_sfnt_off00011821.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11821 11188 bytes
SHA-256: 03c4e51f482853c2a84e9157a85716e511173185886d95d2a10a7615996e0769

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