Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cdc76883e42e844…

MALICIOUS

PDF

82.2 KB Created: 2021-09-17 19:59:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c7f9063b47216e32771e283a973db0b2 SHA-1: 68ce966dbd42d74a71bc5f091b79b53db2f8eb57 SHA-256: 0cdc76883e42e8447fdebd572c9a16a589edab625dc1bc821b6f4895b262478d
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting an attempt to redirect users to malicious sites. The document body was unreadable, but the overall structure and URL analysis indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161429c48f19e2---buwexezu.pdf In PDF document text
    • http://rrbrentacars.com/files/others/87299898604.pdfIn PDF document text
    • https://fpcofmacon.com/nbloom/fckuploads/file/sowesapasuvumefo.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/161365d6243118---62394915772.pdfIn PDF document text
    • http://hosteleriayvending.com/ckfinder/userfiles/files/14385254752.pdfIn PDF document text
    • http://elfuklid.cz/foto/Image/file/zemolotolusejenifodag.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/27658169276.pdfIn PDF document text
    • http://jowinbio.com/upload/files/202109100354217957.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/36pjseqj7ir575ovknslo5tum1/punajazuduparor.pdfIn PDF document text
    • http://zjqzzx.com/uploadfile/file/2021090621482073499.pdfIn PDF document text
    • http://chia4kids.ru/ckfinder/userfiles/files/motexu.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/5d5c2d90815e5e7effc5d5dfb4c2cd87/renugagoziwumaxamopovubi.pdfIn PDF document text
    • http://dentish.ru/ckfinder/userfiles/files/renimoto.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/7d612dfe90bae2e623ba032c029f8ee3/56523322339.pdfIn PDF document text
    • http://jvcc.cn/ckfinder/userfiles/files/210908222322972113546w6.pdfIn PDF document text
    • http://boki.hu/editor_up/mobokokivupituleti.pdfIn PDF document text
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/zudakejewezituxatu.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6cbabc157---manafebelebezazogoxuv.pdfIn PDF document text
    • http://nzozkrowodrza.pl/uploads/editor/file/sufaj.pdfIn PDF document text
    • http://zuszdounky.cz/files/zumexuxozopazogifugiw.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/sozafidetomajokokurezubo.pdfIn PDF document text
    • http://olguanaokulu.com/upload/file/futed.pdfIn PDF document text
    • http://dc-a0dcf319a153.breakthroughsport.com/userfiles/files/luxililifutamobugalafel.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144bb76933ff---mizenarezu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+tell+if+your+android+phone+is+tappedPDF 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_off0000de39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f64b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF64B 17308 bytes
SHA-256: 130c49720ad6c755f0c2aff031f21fbf894a68c06c7a00b71a98a496071f70c7
font_02_sfnt_off00012233.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12233 10884 bytes
SHA-256: 3235cb537c05e7b0f3f69607ac98f4ddda8c2740197cf5d00fc278396874a4e6

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