Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8aee18a6ab788ae…

MALICIOUS

PDF

79.0 KB Created: 2021-09-24 12:33:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b54cb236c68ce18633e12d782050a972 SHA-1: 2b22738a0adab4a97779fb0b1db9c33093391a47 SHA-256: e8aee18a6ab788aeb19e913af909030b23ce4161537fee415d655b474b691aad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicates a deliberate effort to obscure the final destination, likely for phishing or malware distribution. No scripts were extracted, but the overall structure points to a malicious document acting as an initial lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://laborke.ru/uplcv?utm_term=harry+potter+part+1+pdf PDF link annotation
    • https://postelezmasivu-liberec.cz/ckfinder/userfiles/files/97054324747.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/16140d99d72fd4---kiguduvejetutemewaze.pdfIn PDF document text
    • https://doanhnghiepvietnam.org/img_duhoc/files/66401173260.pdfIn PDF document text
    • http://korsorlampang.net/user_img/files/88073513948.pdfIn PDF document text
    • http://qianshunqs.com/admin/upload/xipuginibi.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/botimome.pdfIn PDF document text
    • http://asacnfservices.com/ckfinder/userfiles/files/metutubuzugodivaluvuvuse.pdfIn PDF document text
    • http://yieldpharm.com/upload/files/13101809640.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143343c778be---fagexowelemopewilelor.pdfIn PDF document text
    • https://itandem.net/ckfinder/userfiles/files/5396631439.pdfIn PDF document text
    • http://studionegrelli.it/userfiles/files/papex.pdfIn PDF document text
    • https://awinresource.com/uploadfile/file/65667813825.pdfIn PDF document text
    • http://paradoxine.com/upload/files/simadaleloranewoboxele.pdfIn PDF document text
    • http://tobolsk.fluentrussia.ru/img/content/files/pepidego.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/wejijafawijavabifijupof.pdfIn PDF document text
    • https://romalasergroup.com/userfiles/files/58756433852.pdfIn PDF document text
    • https://masihpt2.com/contents/files/rimekew.pdfIn PDF document text
    • http://emeraldcovepartners.com/_data/images/file/vepigokifubix.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149c948b8e2b---kimopasumapupufuxoli.pdfIn PDF document text
    • http://s-privod.ru/userfiles/file/12996200307.pdfIn PDF document text
    • https://clubforeducation.com/FCKeditor/userfiles/file/38930626543.pdfIn PDF document text
    • http://hotelborgodeipoeti.com/userfiles/files/33794567525.pdfIn PDF document text
    • http://xn--knstlerische-biografie-arbeit-lbd.ch/userfiles/files/pogumizijawolafisagosatuj.pdfIn PDF document text
    • http://519pf.com/userfiles/files/38344084394.pdfIn PDF document text
    • https://evpersoneli.net/ev-personeli/file/nurivotudurepanalosesex.pdfIn PDF document text
    • http://almawred-sy.com/files/adminfiles/files/tafofevupazimegajojosajef.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_off0000d083.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD083 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e89a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE89A 10236 bytes
SHA-256: 4fb554284b5336cff0fc0c1375f505c6cb9c667659f41514594cff9fa42159e7
font_02_sfnt_off0000ffbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFBC 18116 bytes
SHA-256: 175d2b3a7845b62ed57679e401f973cb29950c7a7661500810960a4bbb55f4a5

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