Malicious PDF — malware analysis report

Static analysis result for SHA-256 468a2e214638adda…

MALICIOUS

PDF

72.6 KB Created: 2021-09-05 12:56:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1a03740f777136fa09d369b3966810ee SHA-1: 9b4394fbcc53b3ea600b1f8302f690ad88607475 SHA-256: 468a2e214638adda1ee23b11c0556963f16d48b32cbed0b48176d42b2065fe5f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to external sites, some of which are hosted on compromised WordPress installations. This suggests a phishing or redirection scheme designed to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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://xn--80aamdqpfpr.xn--p1ai/upload_picture/11490546761.pdf In PDF document text
    • http://olynskiconstruction.com/pics/file/rorexikusonuzuseneweros.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/95343567628.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/rosepaloluzadebuvan.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/38344824502.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/mebigasigofujivirinotukej.pdfIn PDF document text
    • http://audidalys.lt/ckfinder/userfiles/files/finogepuxatoxalosapiwik.pdfIn PDF document text
    • http://etpatatietpatata.com/userfiles/files/voxed.pdfIn PDF document text
    • http://dream-mebel.com/pic/file/vezutilorukemabotibiwotuz.pdfIn PDF document text
    • https://kimcert.net/E/file/vukibone.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160dcea2e40800---90121512248.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/44707634315.pdfIn PDF document text
    • https://manualismedicina.hu/fileok/file/litasesipanizelapu.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074d411422af---56479412139.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/10275546116.pdfIn PDF document text
    • http://uhy-th.com/image/upload/files/sitifafozebifaxa.pdfIn PDF document text
    • https://terminal.hr/userfiles/file/kepinorukakopupuj.pdfIn PDF document text
    • http://bsp-plovdiv.org/ckfinder/userfiles/files/murukebigopilararabusiwub.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609f4425c3727---37884893235.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/c1939d2982a173fd21f6c40d49074d6e/gapunereren.pdfIn PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/xinapinabubujimenukizu.pdfIn PDF document text
    • http://gmei.lt/ckfinder/userfiles/files/mabokasibufowizuwaniwata.pdfIn PDF document text
    • http://vaynhe.com/upload/files/42650344843.pdfIn PDF document text
    • https://bestofbucerias.com/upload/file/38755135429.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-5/file/71889586184.pdfIn PDF document text
    • https://vivekanandbawwa.com/userfiles/file/49587948305.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=afm+in+zimbabwe+draft+constitution+pdfPDF 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_off0000b96b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB96B 15996 bytes
SHA-256: 7919daf41a136dc78fa41f314bc45c3f43267ec5b4d841b7af6d486a545953ff
font_01_sfnt_off0000e25c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE25C 11104 bytes
SHA-256: 3bd97c80ab8438f835fb5fa04ae8aa934c4c5747693aa47fb1eb5ef3b1daee34
font_02_sfnt_off0000fc2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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