Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a4bbd1e8ac19beb…

MALICIOUS

PDF

90.2 KB Created: 2021-07-19 13:03:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: e81245fe3004aa30eac13f10d154d108 SHA-1: 420cd65e60966ad9f8a01d8df75d4764a762e8f5 SHA-256: 8a4bbd1e8ac19bebd2c6990fa84f3f6c8f7f1fd6982b44b29d0aeb2499114be5
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it contains numerous links to compromised CMS upload storage and disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the presence of external URIs and the overall structure point towards a phishing or malware distribution scheme, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609858375f710---zikuwetat.pdf In PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/16092eb8e6f9cf---71690053888.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/zagagunamipisonulibuf.pdfIn PDF document text
    • http://bukharasuwanee.com/sites/default/files/file/paruxemafowi.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/3nbam56pcjk9ioltb7qbndr7g2/33570935313.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160741044a20ae---dusebupup.pdfIn PDF document text
    • https://www.geo-decouverte.com/ck/ckfinder/userfiles/files/vobobekekaze.pdfIn PDF document text
    • http://deborahkay.com/ckfinder/userfiles/files/40386497293.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/e9q3dcv48c9usftn1eu1m0dhj1/52501493481.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160b6819d09252---99986277359.pdfIn PDF document text
    • https://pepinieramontana.ro/ckfinder/userfiles/files/60480318685.pdfIn PDF document text
    • https://crownprolaw.cn/userfiles/Proj_Name//files/29652875459.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a851d05f5c3---76345048797.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074d628d46a9---35028336227.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/3ao01ooiu82kg05nukto8df4i1/19729195739.pdfIn PDF document text
    • http://endemic-capital.ru/uploads/files/wajoruvevuzepaz.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021060615032222.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ba86a3f96---pomunej.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a033d4a1c56---kunutajuvogumuw.pdfIn PDF document text
    • http://qlinairnv.be/userfiles/file/tavimamesuwavasofamazokuw.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/16074fbc4efa07---sijiwe.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/26lt7hepg033itvofj4muh99se/97172283314.pdfIn PDF document text
    • http://maynenkhipuma.vn/quangbasanpham/app/webroot/upload/image/files/getizab.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f85762fd1a---simawalabugadetonakederal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=foundations+of+finance+pdf+downloadPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e30a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE30A 16920 bytes
SHA-256: 0615a58029ed9637d82248b75645348d1809c4c425d9a26b81b398f49efd36ce
font_01_sfnt_off00010f13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012724.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12724 17888 bytes
SHA-256: bf1e542794a37fa8f22cc6d338fa3135971f71ade3d73eb5b59c6a12841a02c5
font_03_sfnt_off00014257.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14257 10676 bytes
SHA-256: 1f55831da1e742645cb7c77c08d66a3158412dfa01a83dc891ed0178aa3c9fee

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