Malicious PDF — malware analysis report

Static analysis result for SHA-256 37fb1253f81298a6…

MALICIOUS

PDF

90.8 KB Created: 2021-07-16 10:31:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7025b2c1c96928bc95f659b4f3e4d1df SHA-1: 50c886eac8361ca5afa404609db739f4bcaf348f SHA-256: 37fb1253f81298a66bbe17ba779d68cb1a9b41d335a47af2c9d6137cb30a9165
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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 https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/k2agquvv1o4vn3uubn1ccvclfd/59393006296.pdf In PDF document text
    • http://tasteofruraleurope.eu/upload/File/mofuvoraz.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/mleuegfth504l060so9t6qfve6/73667388553.pdfIn PDF document text
    • http://notarbrazda.cz/userfiles/file/20342217734.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/nipelogeba.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16071496e05e31---xulefexino.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b9a12779cfbc1711f0305a3e9eec6a99/65020837764.pdfIn PDF document text
    • https://beatmuellerfoto.ch/userfiles/files/vuzuti.pdfIn PDF document text
    • http://edwindijk.nl/home/edijk/domains/edwindijk.nl/public_html/uploads/file/91140831499.pdfIn PDF document text
    • http://chaitraglaze.com/uploads/12055511359.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16094960f70bd8---nasimumusatare.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/9f2672e93e2b661c5d06a0507c3e3f49/3377683925.pdfIn PDF document text
    • http://nhadephoanhao.vn/upload/ckupload/files/jelofop.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/k8a6eop8nkguhbpr6s82jn0ci4/goxomafilujedisoto.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b1aa3b9d62f---repoxobejimokaxozotujos.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/pakodu.pdfIn PDF document text
    • http://hkxhjfc.ltd/uploads/files/20210710115001.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160966f26981df---tojot.pdfIn PDF document text
    • https://irantruck.ir/data/file/51922132066.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3445e6c91---92362669225.pdfIn PDF document text
    • http://sieuthibongda.net/ckfinder/userfiles/files/10828047273.pdfIn PDF document text
    • http://daimarconstrucciones.com/images/admin/file/68803284146.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160bbc8dd6c36a---74008119457.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/d519344803ff08432d9c19f7cd8de22c/farexinunus.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/bufajanevatikozibegenare.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=toy+poodle+chihuahua+mixPDF link annotation
    • http://irodori.kir.jp/files/file/11936956523.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_off00010134.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10134 17344 bytes
SHA-256: 90829078983d61fe767812c74f90c72bbaa001758722c032e4dfb3a789b13f4c
font_01_sfnt_off00012de6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DE6 10588 bytes
SHA-256: 05d2f0ca01649d82ef2434cb36f18f655a78793e974891ebc596ffe6bce2b6c9
font_02_sfnt_off0001460e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1460E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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