Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e0b276c4b6b29dd…

MALICIOUS

PDF

83.1 KB Created: 2021-09-19 05:16:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 753793a0cb238374bdfcb0bc8adb6602 SHA-1: c7d99e048aa3c97d2dc5a37b85846682249869ef SHA-256: 4e0b276c4b6b29ddaa35e4daab8099065c7ef067467f2a2426958472e4a42d4c
164 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to other PDF files hosted on compromised websites, indicating a link farm designed to obscure the final malicious destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://xn--80aaijz0c.xn--p1ai/ckfinder/userfiles/files/64362936846.pdf In PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/6912614129.pdfIn PDF document text
    • http://www.heksan.com.pl/file/tazipajarikivax.pdfIn PDF document text
    • https://fuoriscena.eu/file/xesizelebozogixe.pdfIn PDF document text
    • http://dblbtech.com/userfiles/file/90082067434.pdfIn PDF document text
    • http://sonnenheizungen.ch/fckeditor/editor/images/file/15925818357.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/9be2fae29ab1c0d197c69f329521c70f/3972912181.pdfIn PDF document text
    • http://etalentlink.com/uploadfile/file///2021091322090663.pdfIn PDF document text
    • https://probidjp.com/ckfinder/userfiles/files/20210910_002447.pdfIn PDF document text
    • https://ra7a7p-h3ba7.com/contents/files/83864446648.pdfIn PDF document text
    • http://geonatlife.es/ckfinder/userfiles/files/45321728348.pdfIn PDF document text
    • http://taxplus.in/images/contentimages/files/74093376450.pdfIn PDF document text
    • http://conblocmanado.com/pics/file/27000215278.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/nanon.pdfIn PDF document text
    • http://elcivan.com/admin/UserFiles/file/42718846955.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612eaa803978d---70861634719.pdfIn PDF document text
    • http://tsnpharma.com/upload/files/najikutelavut.pdfIn PDF document text
    • https://rapn.ru/ckfinder/userfiles/files/gusaxeta.pdfIn PDF document text
    • http://pressvaluation.net/FCKeditor/editor/filemanager/connectors/userfiles/file/fubigadabosixalolugafuj.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131313d652e8---36106059120.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/16144b15113f81---devawer.pdfIn PDF document text
    • https://www.miotsukushi.or.jp/system/ckfinder/userfiles/files/wiwedinalujelujagugep.pdfIn PDF document text
    • http://allgeology.ru/ckfinder/userfiles/files/vubel.pdfIn PDF document text
    • http://aroma-es.site/yamituki-n/uploads/files/78999361771.pdfIn PDF document text
    • http://timebymtm.com/upload/files/lodegara.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=supermemo+for+androidPDF 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_off0000db82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f394.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF394 19308 bytes
SHA-256: 47fdf5a8d335cb91ce35e9abf2ec424b9bd7860423d2a9de98021c96b59b819d
font_02_sfnt_off000125c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125C8 10524 bytes
SHA-256: 2342402ba036f523e741949fac8f24e3a63e3bc10673154121950d81742f1551

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