Malicious PDF — malware analysis report

Static analysis result for SHA-256 d85b36c47439132e…

MALICIOUS

PDF

83.7 KB Created: 2021-09-16 20:09:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: cbb9614cb0b1ee2772f6d733b39f065e SHA-1: 771f7be195a0c098eed2e0ef766b52caf6fe2b5a SHA-256: d85b36c47439132e33aed1c63614d5f7c554dd02681755466d82efaa63d65dae
176 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal malformed streams and a link farm pointing to compromised CMS uploads and disposable hosting, suggesting the PDF acts as a lure to external malicious sites. The presence of numerous unknown URLs further supports this, as they likely host malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://sushikyototogo.com/uploads/files/tigoluru.pdf In PDF document text
    • https://mclandpin.com/calisma2/files/uploads/mekodozi.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/161393fd559975---66149181069.pdfIn PDF document text
    • https://efsanepin.com/calisma2/files/uploads/govaxajirobojenebaxivevoz.pdfIn PDF document text
    • http://smm-mm.com/uploads/news_file/xamanatenedazepo.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae083671fd---70369021830.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/89696146700.pdfIn PDF document text
    • https://ichibaninfotech.com/ckfinder/userfiles/files/buramezitibozejix.pdfIn PDF document text
    • https://dmshospital.com/mm_engg/files/kosusulezovepisux.pdfIn PDF document text
    • https://medarbindia.org/ckfinder/userfiles/files/nutujinisugijimuxara.pdfIn PDF document text
    • http://abwessex.com/uploads/files/14263019169.pdfIn PDF document text
    • https://anandalaya.in/resources/file/jemopul.pdfIn PDF document text
    • http://ceramvetro.net/userfiles/file/82806956204.pdfIn PDF document text
    • http://gardenofsound.com/userfiles/files/78185780032.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/5ebb328e6db0316917eff6dc2c58a41f/majevuvosezabu.pdfIn PDF document text
    • http://www.sudeshnamaulik.com/fckimages/file/18454925102.pdfIn PDF document text
    • http://gospel-pour-100-voix.com/fichiers/newsletter/file/lebikovadimozafajotad.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/61361980304.pdfIn PDF document text
    • http://vagtteam.com/userfiles/Files/31112240074.pdfIn PDF document text
    • https://srmhomes.com/images/bulk_images/files/varuzofetodegexutup.pdfIn PDF document text
    • https://haltia.mx/sii/ckfinder/userfiles/files/xujapomodifevatobisi.pdfIn PDF document text
    • http://citescolairedeledit.com/include/file/93871142791.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=how+to+see+who+watched+your+instagram+profilePDF 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_off0000df13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF13 18520 bytes
SHA-256: 9f2dd10c84fe9068354b605c232e3b4a060dc100db03d7934fe56c386245a4cc
font_01_sfnt_off00010ed1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ED1 11360 bytes
SHA-256: ec7acbfaa6b98e10be2793f45bef3ff2ab3ed2a54213f07cd8c1fd2750c0c396
font_02_sfnt_off00012937.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12937 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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