Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d165c819a85072a…

MALICIOUS

PDF

72.0 KB Created: 2021-09-03 20:56:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ff025a64abd79dcd2bed1818f511060d SHA-1: 5c7e2e9f5df7bf07a7c51b9e62082b6a8224e5ee SHA-256: 2d165c819a85072a9c2582eb1e4671e1dc7f648ee51cf9fdfc9b225df420ce4c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress sites, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or delivering a secondary payload. While no scripts were explicitly extracted, the structure and URL patterns are consistent with PDF-based phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://coretry.ru/uplcv?utm_term=lpr+physiology+textbook+pdf PDF link annotation
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/ghc5ahu9umu5adtn4k09m5b249/rarowapepejomareweminam.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/pin9pphf63oku1np0imn5m59or/sugorezonapazojijo.pdfIn PDF document text
    • https://impeka.lt/components/com_mijoshop/opencart/image/data/files/dikubasabu.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/852be0be006044321aa5d10516e8cd11/78147695252.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/333ad2e95a75f16baac7221b1a735fad/94519912563.pdfIn PDF document text
    • http://razzledazzleevents.in/userfiles/file/47217633775.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/76105626704.pdfIn PDF document text
    • http://stimatacasa.eu/userfiles/files/69402284903.pdfIn PDF document text
    • http://jar-ted.pl/file/2831479025.pdfIn PDF document text
    • http://oikoscoccatoarchitettura.com/userfiles/files/54796731951.pdfIn PDF document text
    • https://supermagnum-bg.com/userfiles/file/79185411512.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/zijufubixujasadegi.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb11706f3a---defovuluvibebufuri.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093d289a40af---bafogopebagatunojul.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/wugogox.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/2327545056.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/a23cffb4eaabee4591aabf56942256d0/sewipozusuzuximajerizi.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/poxanulinezufukogujol.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9633bd903---wogusomewew.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/40146061d652cb305d48b372c3fe7e09/67671510350.pdfIn PDF document text
    • http://kcntanduc.vn/img_duhoc/files/xibipevimibirisilogux.pdfIn PDF document text
    • http://eltdb.com/UserFiles/files/85106025921.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/9836c9382d7d11393ad1eb647c9a0f20/galefumago.pdfIn PDF document text
    • http://kadernictvo-svetlana.sk/editor_uploads/system/files/rasenodikifiziwifowebu.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/4108a16280e4065731a0102702303d31/25693088594.pdfIn PDF document text
    • 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_off0000ba26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA26 15652 bytes
SHA-256: 7d63746a584e03d5d2ee9c762f1abcefa877d791e1a852716f5f056f2d7edd48
font_01_sfnt_off0000e171.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE171 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f988.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF988 10916 bytes
SHA-256: 50339c673a628b78f1231e04aa01912bf6ef5587b8f56b37645e6832cb082c77

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