Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee4dfd1c14e86322…

MALICIOUS

PDF

84.3 KB Created: 2021-09-04 16:33:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3df7187e5ca0d5e93bdd69bc3906d95e SHA-1: 5b060bafcb6228d2683374b210a12d501658077e SHA-256: ee4dfd1c14e86322e6fb725dc0ec458dfd7d940d97b218add9c1cdcd5158c082
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing lure, potentially leading to further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://crysiq.ru/uplcv?utm_term=system+thinking+in+management+pdf PDF link annotation
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607282dc6644f---bajosopopawoxof.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16076bb8c0a65d---2927143789.pdfIn PDF document text
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/28c50722913a33fd0a16bf1d72e001dc/bapijesuresiwakupigukadu.pdfIn PDF document text
    • http://szalkasszorutacskok.hu/app/webroot/files/content/files/21441247033.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/9p3ipgmir039b75v3fqcvo48pb/27280692419.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608ced5353b66---janunimuzikewewobik.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070eac43faba---8670471937.pdfIn PDF document text
    • http://jpbullies.com/clients/2/2c/2c827f09d77a589c2c5c7da8c033a3f4/File/74309941665.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a25db5f0483---80655855707.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160838beb02009---60800236373.pdfIn PDF document text
    • https://kolbandibileklik.com/resimler/files/samafitedoze.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b64314719b---javopimakas.pdfIn PDF document text
    • http://llux.vn/uploads/files/3689523965.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/vre8jvd89jsqcds2sp41uiq7ui/lofawetoxezifu.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb2823d00a---ruguralunekiwaxobuw.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/94956176432.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160751589a0847---zafaleb.pdfIn PDF document text
    • http://affordableadobe.com/ckfinder/userfiles/files/pimeduvijekefub.pdfIn PDF document text
    • https://maplesservice.com/wp-content/plugins/super-forms/uploads/php/files/149a3195e584e8aa8451a1597382bb98/nubosoniriredufuwurarene.pdfIn PDF document text
    • http://phongkhamthienhoa.org/images/files/99976574600.pdfIn PDF document text
    • http://tayles.com/uploaded/14772569773.pdfIn PDF document text
    • https://dbmotorbrokers.com/userfiles/file/33227812825.pdfIn PDF document text
    • https://clubforeducation.com/FCKeditor/userfiles/file/75674054079.pdfIn PDF document text
    • https://luiginoiobbi.com/userfiles/file/31321720251.pdfIn PDF document text
    • http://hasanmasat.com/ckfinder/userfiles/files/31122172523.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_off0000e211.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE211 10960 bytes
SHA-256: cd5b09a293bc4f842e01b953a9eb3ca47b8f4894daa0f1b118086091c83263ec
font_01_sfnt_off0000fb1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB1F 18868 bytes
SHA-256: 89fa38cc19d41c52df9e1b950744d6d86b4e1de161c61df175b223921e65c695
font_02_sfnt_off00012bc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1