Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d807d63e8faecfd…

MALICIOUS

PDF

86.3 KB Created: 2021-08-30 13:47:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 15d00fd0deb43ed250bbfca19180cc11 SHA-1: f7e608eee2430673de0f00927e2e4a7a7142df8c SHA-256: 4d807d63e8faecfd5863a1649dec57e78836816eafe05ba15b72032c6e294ac9
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress uploads and other disposable hosting sites. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://syarmarka.ru/userfiles/files/lumusodutaxosete.pdf In PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/e59a7d7506376fe23a2d41393162ec6e/34459572721.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/duvamapalavutenebezerolez.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609da741ab4cb---90606129869.pdfIn PDF document text
    • http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/40410378294.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/29936357644.pdfIn PDF document text
    • http://zuche0551.com/upload/file/ruzilurikefeduwa.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/un9h1b864nnfmrb5qoelkqu416/81185325942.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/i0uj1k6h0cqui6l2jq1m4orfuo/rosivubi.pdfIn PDF document text
    • http://xingyeknitting.com/userfiles/files/bilugumetomowixakavus.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/p57o93fev1ghe35ptgfoduulam/45551536837.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/82e9c73accafe26ad943657b0ccec396/37843649451.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/8473065676.pdfIn PDF document text
    • http://xn--rssx31a7tec6p.com/upload/userfiles/files/20210714081726.pdfIn PDF document text
    • http://jessie.vn/images/ckeditor/files/kanedafikidexefajif.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/c7nsi30gllmi2hmpu28qdh53l3/54064251818.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/mukogupetevalitubuj.pdfIn PDF document text
    • http://kochi-mimoto-iin.com/TakamatsuClinic/userfiles/file/jugaxujosukatura.pdfIn PDF document text
    • http://studiosaletta.it/userfiles/files/64730641015.pdfIn PDF document text
    • http://17njl.com/userfiles/files/vujowozejo.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/busuzujinoremimuruwajil.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/dcd14a84a1d663f2730e7274107bfd4c/66313292087.pdfIn PDF document text
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/49072414540.pdfIn PDF document text
    • http://guerrazzi.info/userfiles/files/55534833579.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=pure+red+cell+aplasia+treatmentPDF 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_off0000ea45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA45 10656 bytes
SHA-256: f56e0836d7ab62802f7074c145ec104d8db34b2fe061368ea37cc27314f86e93
font_01_sfnt_off0001029e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1029E 18504 bytes
SHA-256: 56a1eb0293e16b0260114b017f80b71d0b346e86d51a903593ae34b2e97feff0
font_02_sfnt_off000132f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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