Malicious PDF — malware analysis report

Static analysis result for SHA-256 614385dedd5dd746…

MALICIOUS

PDF

82.8 KB Created: 2021-09-13 20:10:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a01f3948c62ef3dda9348d4f4c77eca5 SHA-1: 8c2016ea21afa2cb4a35b35b46d0fc1b9e0afd1b SHA-256: 614385dedd5dd746a8a2365d949e97ae6d62916426ec031db2f04f150dfe111d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The presence of numerous external URIs, including links to compromised WordPress uploads and disposable hosting, suggests a phishing or malware distribution attempt. The document body is heavily obfuscated, but the heuristics indicate a link farm strategy, likely to disguise the true malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://krisoc.ru/uplcv?utm_term=descargar+juego+de+plants+vs+zombies+para+android+gratis PDF link annotation
    • http://szpk.hu/_user/file/lojupivixadasamorop.pdfIn PDF document text
    • http://vidol.nl/userfiles/file/32373659908.pdfIn PDF document text
    • https://autohausnschmidt.de/userfiles/file/485909893.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/tunidisexubazamutexozaxo.pdfIn PDF document text
    • http://huarui-bio.com/upload/files/47207321523.pdfIn PDF document text
    • http://yokosohk.com/files/fckfiles/file/xelex.pdfIn PDF document text
    • http://kimdaiphatsteel.com/Images_upload/files/91140263419.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16131943202dbd---jopazopuxagiri.pdfIn PDF document text
    • http://hoadondientu-ptp.vn/images/ckeditor/files/55192146165.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/33900847874.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137aa633e168---gekanavezafobesugux.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/82125551666.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/88341996037.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/fogivojokuzidosovates.pdfIn PDF document text
    • http://grubstreet.ca/ckfinder/userfiles/files/79083524791.pdfIn PDF document text
    • http://clubmaniacr.com/campannas/file/laliwiput.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/xosamivafalisepeledi.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/kalofutafesalago.pdfIn PDF document text
    • https://aviseco.ro/userfiles/file/tutesopikopakorawoxefu.pdfIn PDF document text
    • http://3suntech.com/UploadFile/file/20210911181202198.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612fca67aa70b---94013107066.pdfIn PDF document text
    • http://ambvetsanprospero.eu/userfiles/files/32103184049.pdfIn PDF document text
    • http://kenshopvn.com/uploads/files/xazipexuxarij.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/02ssh8tbmc49s47emeo7arnj03/lajesufa.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_off0000d9ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9ED 18916 bytes
SHA-256: 6e0777c7968ca45929c531ad5a022268bd801ea315376799908701f3157231c1
font_01_sfnt_off00010a51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A51 11356 bytes
SHA-256: 39f57eb2c9523024ed9f79991638c5b6415f95e448b014dd80f305af6400167d
font_02_sfnt_off000124ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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