Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd6eef3f7bf6713b…

MALICIOUS

PDF

82.4 KB Created: 2021-09-13 04:47:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8d0bc755c42d8b77a174c4b17d11b418 SHA-1: 7845e47c60acab4d8b73ac3d2afed090f0bb932f SHA-256: bd6eef3f7bf6713bdbea6463b2cd342b576eefad697dcb37ab8dcdc1fbc5ff1e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a malicious document, potentially leveraging embedded JavaScript for obfuscation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=apps+that+give+you+robux+for+free PDF link annotation
    • http://gjbbang.com/userData/board/file/97484263038.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130805e8c564---jorovidobirel.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210911/file/31224398275.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613c6ed384697---sivasopoxepoduno.pdfIn PDF document text
    • https://cukimentescukraszda.hu/files/files/80643093983.pdfIn PDF document text
    • http://www.pes.edu.mn/ckfinder/userfiles/files/10474827213.pdfIn PDF document text
    • https://strategieb2b.ca/userfiles/file/petemipu.pdfIn PDF document text
    • http://jarosi.hu/files/file/lujabebagosipopajig.pdfIn PDF document text
    • http://halanmilk.com/upload/files/7527831892.pdfIn PDF document text
    • http://linyuepharm.com/upload/files/xujagog.pdfIn PDF document text
    • http://quartierdete.fr/uploads/fckeditor/file/53618230115.pdfIn PDF document text
    • https://perfecthospitals.org/FCKeditor/file/zefewofeg.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/tutubowezujego.pdfIn PDF document text
    • https://eghamatsafar.ir/basefile/eghamatsafar/files/vovixojonagopak.pdfIn PDF document text
    • http://dolinakrzeptowa.pl/public/upload/ckfinder/userfiles/files/70348727432.pdfIn PDF document text
    • https://redengewinnt.com/userfiles/file/83267945902.pdfIn PDF document text
    • http://myjobcareer.net/userfiles/file/2021091305293173499.pdfIn PDF document text
    • http://fitviewer.biz/files/file/38732039935.pdfIn PDF document text
    • http://pension-erlkoenig.de/img/editor/file/torisexoxogojowewoniji.pdfIn PDF document text
    • https://h16hr15k-h19hr37urn.com/contents/files/tizuzifoxe.pdfIn PDF document text
    • http://sentezetutmerkezi.com/upload/ckfinder/files/74638122512.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/e105f5a5833e59dcc6916a5d52adeeb1/40428359048.pdfIn PDF document text
    • http://bobhendrix-law.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nemubimixitopakorif.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_off0000dcc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC5 10988 bytes
SHA-256: f00a5f9d422fae6ca6326f6b1f793498d07b0f8ec0ea7b91a20330063c97fdd3
font_01_sfnt_off0000f656.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF656 18000 bytes
SHA-256: 0baca2135a1c270e19da799f8a0749154f24e547dc63b58f3d5ae9b5a7968f77
font_02_sfnt_off00012474.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12474 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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