Malicious PDF — malware analysis report

Static analysis result for SHA-256 7da1e96ca56d59c3…

MALICIOUS

PDF

109.0 KB Created: 2021-06-26 11:49:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ddb27950fe02d61e0abc41a576365d3c SHA-1: 9e0eb607a34924eeeb5f1cc2ad5bb67140be98a1 SHA-256: 7da1e96ca56d59c30200062e4d48bb719b7f35d30e6bb1df85aed86a5d69d772
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm directing users to multiple compromised WordPress sites, likely to host malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically a phishing or trojan distribution campaign. No scripts were extracted, but the structure and URL analysis point to a downloader or redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9780

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 http://agendatourvietnam.com/hinhanh/file/wagogogugajexudotakovo.pdf
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/f4ae3f93ab04c1e411109641be21d946/88422624811.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a33372258e---vunatazid.pdf
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f088fd948a---kimer.pdf
    • https://abeess.com/userfiles/file/8141190386.pdf
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc57368fde9---getapulavada.pdf
    • http://amctop.com/board_data/editor_img/file/202105191012.pdf
    • https://indobaliart.com/sitefiles/file/44874476221.pdf
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/e26b622e5831a88353d83d4eec742a54/sodabab.pdf
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d276294d7---regegifumajima.pdf
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/9c72244ee06fca464e45d411d86feb58/jekovorefokukoji.pdf
    • http://pileshoppen.dk/userfiles/file/wolowopivumodeburozo.pdf
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/6bad02e3c59dfa320dfbace1e37dc9f7/jerivaf.pdf
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/8209b04af344408ab39677202b050c1e/dezigomewegu.pdf
    • http://andrelandberg.com/userfiles/file/16983054651.pdf
    • https://akapacha.com/userfiles/file/binalubuzu.pdf
    • http://akinmedikal.com/uploads/file/vesaresenibimivudajizo.pdf
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e15cba2fb9---kexizitorolap.pdf
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/ac93a6cd95c83f9124ccab99d04e3135/bewilizopebodufubuj.pdf
    • http://riskhedgetech.com/uploaded/file/42481024060cfbb51e6a46.pdf
    • http://firanywiktoria.pl/uploads/editor/file/mebizitaxo.pdf
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/5a6a118cd4e81c076fb30bf3fdd5f97a/jawalimiruroruwobixukoge.pdf
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rebixiwibobifalizokema.pdf
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b4ad521d36---zosifezisatokinubomo.pdf
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a37729d9610---77659834828.pdf
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/32eb4c5a753c8bcec37aa95bcd70494a/14502993163.pdf
    • https://egyiksem.hu/uploads/file/nedibogi.pdf
    • http://menafundinfo.com/userfiles/file/20942316229.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=r+data+cleaning+packages
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000145e3.bin
93f906ba79888914c841302e668df2452c2666f8e9726758559c3588ceb477d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x145E3 10604 bytes
font_01_sfnt_off00015e08.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15E08 16792 bytes
font_02_sfnt_off0001761a.bin
e31d4438c5a2ce80ef6a62ac9ea04a554085cbaff97e5562f40ea7318a281348		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1761A 18268 bytes

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