Malicious PDF — malware analysis report

Static analysis result for SHA-256 4506e220f567e52b…

MALICIOUS

PDF

81.9 KB Created: 2021-08-31 22:15:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f77ce5ae659a83cef7ddd3210d521c83 SHA-1: 5e697ab0698c262531f013f4f295a08a23526aff SHA-256: 4506e220f567e52b8ed2340dfde19e8fe5f8f064fc03ec5e9616e6f558d36629
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to external sites, some of which are hosted on compromised CMS uploads or disposable domains. The presence of external URIs and the overall structure suggest an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://notariocprietoa.com/notaria/documentos/files/76780198299.pdf In PDF document text
    • https://gmt-tw.com/app/webroot/userfiles/files/57871479436.pdfIn PDF document text
    • http://ansing.nl/userfiles/file/71826192947.pdfIn PDF document text
    • http://purepoem.com/resource/docContentImg/file/2021-08-07/1af120fed5feea5fc1dc541fdba379e0.pdfIn PDF document text
    • http://kingalbertltd.com/uploadedfiles/file/92889266728.pdfIn PDF document text
    • https://veterinarycarefoundation.org/userfiles/file/nowudoj.pdfIn PDF document text
    • http://jingkangchem.com/upload/files/gapilabasimoj.pdfIn PDF document text
    • http://apvn.info/userfiles/file/wogawumigi.pdfIn PDF document text
    • http://kiiga.ru/userfiles/file/wawam.pdfIn PDF document text
    • https://sgicorp.com/userfiles/files/fetuvisuwugubigojobu.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/mupoza.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160af03a54540c---vinekegorupowuzisufupaj.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eaa807c263---25175184201.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607118cb80078---fidonuvumuvisamu.pdfIn PDF document text
    • http://cancercareresearch.com/userfiles/file/78282082961.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/vt2ats1rsqebmt5sm56htpmi6e/75262954282.pdfIn PDF document text
    • http://www.pes.edu.mn/ckfinder/userfiles/files/julefakemikobosesotufife.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609eaa7be6bcc---roridetorigi.pdfIn PDF document text
    • http://minuspk.ru/minuspk.ru/userfiles/file/62653303295.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3820a45f6---76961073484.pdfIn PDF document text
    • http://edv-denk.com/userfiles/file/14564156386.pdfIn PDF document text
    • http://solis.altrodesign.eu/ckfinder/userfiles/files/mimagatewajojaxireki.pdfIn PDF document text
    • https://tailormade-sales-marketing.com/userfiles/file/59054993689.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/2a47dcb4e14abfbf0ce1b3cfc0d369b3/jijixujo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=do+you+need+a+notary+for+a+willPDF 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_off0000dcc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC8 10480 bytes
SHA-256: bed978645c77eda0d2f790b171a8cc56145c3b39d59e5047e8fa660422084057
font_01_sfnt_off0000f4c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010cd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD8 17652 bytes
SHA-256: 96b22b2a163368fb14b4c23a7c79fe51c8d77511fcc149b5b57fd7ae15f1daae

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