Malicious PDF — malware analysis report

Static analysis result for SHA-256 227752635e0cc8c4…

MALICIOUS

PDF

86.9 KB Created: 2021-09-05 20:22:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d7557adfbd1a8626cac40823cf82a586 SHA-1: 06a0e2435e89984ef3674fc891d64aff8d992a6d SHA-256: 227752635e0cc8c4b4c9a8a218648c7b6d765be343c11c9db2976d5ea77081de
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users to multiple external URLs, many of which are hosted on compromised or disposable domains. The presence of a 'download button' lure suggests an attempt to trick users into clicking these links. The document's structure and the nature of the linked URLs point towards an effort to distribute further malicious content or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://catamma.ru/uplcv?utm_term=food+safety+management+system+manual+south+africa PDF link annotation
    • http://maquinandoysubastando.com/dleyes/admin/fotos/file/69629998126.pdfIn PDF document text
    • http://donghotam.com/luutru/files/dawokimurupiwudatexepup.pdfIn PDF document text
    • https://termofriz.rs//files/sifokan.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f86d333223---wadasukobaseg.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/7a5d069b19ba84404701ffd32621af96/31694734429.pdfIn PDF document text
    • http://africareview.in/userfiles/file/39835489183.pdfIn PDF document text
    • http://vimar.ua/userfiles/files/xojumigajexeperapojuxu.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/b00fb2c9fc553f0a63bea628c679af08/76252926596.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/octeug1mgp0rhu8gmbgpku2vg5/xigodez.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac47bd1e65d---bukija.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/fupetifejeno.pdfIn PDF document text
    • https://sofanet.ro/ckfinder/userfiles/files/xajegubobavefasila.pdfIn PDF document text
    • https://fonixkoncert.hu/upload/file/70859660088.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a7be2b19bf4---renopudiliwofulodev.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b398a99f476---41261015650.pdfIn PDF document text
    • https://detskeihriska.eu/ckfinder/userfiles/files/99936746618.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/b557d37e83d7ef8aa773b922e1d7e47e/loruzatixebuvowez.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9c58328e6---rajov.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/64618285567.pdfIn PDF document text
    • https://maychieuvinh.vn/upload/files/54998777996.pdfIn PDF document text
    • http://universe-micro.com/upload/files/20210702_195605.pdfIn PDF document text
    • http://esistore.be/userfiles/file/kirukajefalolali.pdfIn PDF document text
    • http://smolninskayahotel.com/userfiles/file/setuxopi.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_off0000ee7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7D 11116 bytes
SHA-256: 3c2dd4dd1e09c16df5b92ba061d301182010574f36d370d54612e09f011ab9b9
font_01_sfnt_off00010803.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10803 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012015.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12015 17920 bytes
SHA-256: fb91a7165d652ce8200ea48503d092634d0e0ac44c85d20c194ec3b06b0db342

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