Malicious PDF — malware analysis report

Static analysis result for SHA-256 c10de1feb931af87…

MALICIOUS

PDF

105.5 KB Created: 2021-06-28 18:00:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 8bb918b2e1b230b5b75579f5d68e691b SHA-1: 76f62bd5e12565029a721f71b32e7d4d75f830c1 SHA-256: c10de1feb931af87fde8f5bf1d350ac8f60256f9c3a0dce1d1a5b4f67b9efd35
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress upload directories and other disposable hosting. These links likely lead to further malicious content or exploits, suggesting an initial access vector via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9874

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://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c5e6ee4d609---94718941412.pdf In PDF document text
    • http://hydrem.ru/images/file/sebupabilajop.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606caa193847d---kuwitazar.pdfIn PDF document text
    • https://willmarlakesarea2040.com/ckfinder/userfiles/files/rejufesagonatoxojikawiwe.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d31581d0378---kutototoguxu.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/dg2bo3mdq92gfbi0aca6scer63/pawabadutopubefevomofaf.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/wokobomixig.pdfIn PDF document text
    • http://logo4you.dk/userfiles/file/6499322774.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/cb27f49f46335f6ba48295b8202c1e4b/zupuzobubipolemibunob.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075df108f45c---besetobaxarewedawanokoje.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a27f9721def---xilarukadotizofa.pdfIn PDF document text
    • https://solener.info/ckfinder/userfiles/files/72002019872.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c08d11a84---39196325759.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/88cc54d8538f1fdd1d2838db3c71f8a3/pilesenananufodifotimifu.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a100a28a6f6---58166282259.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/r05co7ap3ja9o7dohfd80buv07/gutenuseluraviwuzelix.pdfIn PDF document text
    • http://artpolinakuzina.ru/pict/file/44677710888.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1015490df---dedanabojemugamewokuxatex.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/14526023906.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/0o1j7mip030u5jku1sdkhs3m5k/vekoloxasabexim.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/ttjsjvon0jkng0fu9moh4hq7i2/rutulomipomab.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/775c174227a59fd1460be3fe4756262c/9437778709.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c706ad52e---19339936819.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/34512027891.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=10+to+the+12PDF 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_off000131b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000149c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149C7 19208 bytes
SHA-256: 265819e0de263eeec4d879c8f9460de7bbe7e77a0292629ffec09525d4f426c6
font_02_sfnt_off00017b45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17B45 1704 bytes
SHA-256: 822b0cbb6b2f9cb792b89701d97568ebdd5b83fdf3a8fb2b8e5f8d7785a8f2f8
font_03_sfnt_off00018366.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18366 9728 bytes
SHA-256: 19bfaf920782a21bca0665f76a988fa2f195183ad8b825ce1a5f48677e08221d

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