Malicious PDF — malware analysis report

Static analysis result for SHA-256 0da741eba10755ad…

MALICIOUS

PDF

70.1 KB Created: 2021-09-16 23:30:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 01a20686b133037356c7d3d0ec38986a SHA-1: f52dd74cd110c00f6809c7154195f222dd6f0278 SHA-256: 0da741eba10755adef80cdec0953c82773a0e70cb5ca72a7152804cd2f11dd6b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://cfi-registration.org/buzzboxgift/img/userfiles/files/4046015108.pdf In PDF document text
    • http://tandprotheses.com/ckfinder/userfiles/files/72250184016.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cef5412007---43105733287.pdfIn PDF document text
    • https://thehouseconcert.com/ckfinder/userfiles/files/16151455993.pdfIn PDF document text
    • http://e-hematologica.pl/users/file/54299342149.pdfIn PDF document text
    • http://www.cddfct.com/up_files/file/soxakiralamaku.pdfIn PDF document text
    • https://anna-bel.com/app/webroot/files/userfiles/files/papozisetajone.pdfIn PDF document text
    • https://detskeihriska.eu/ckfinder/userfiles/files/rojatemenefidomunolorow.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16133a8c60385a---39476166925.pdfIn PDF document text
    • http://myblindz.com/fck_user_files/file/korubezawaja.pdfIn PDF document text
    • http://revucue.com/ckfinder/userfiles/files/zozaguxevonamavukupe.pdfIn PDF document text
    • http://1hozain.ru/files/userfiles/files/29588504805.pdfIn PDF document text
    • http://mcutech.net/upload/2021/09/file/1631317073361174552.pdfIn PDF document text
    • https://srmhomes.com/images/bulk_images/files/93159402925.pdfIn PDF document text
    • https://terracell.pt/images/file/48100784419.pdfIn PDF document text
    • http://www.teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/30325084511.pdfIn PDF document text
    • https://alubiasdetolosa.com/files/galeria/files/98462001064.pdfIn PDF document text
    • http://kredoteka.ru/uploads/file/pudenakuliwefawipama.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/q2kodoo9bqg18ha13i9r43utm6/87532408040.pdfIn PDF document text
    • https://soalmatematik.com/userfiles/file/lanewe.pdfIn PDF document text
    • http://snuhonors.com/userfiles/file/51535107712.pdfIn PDF document text
    • http://www.detskaoptika.cz/ckfinder/userfiles/files/4218713862.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=apk+kof+97+androidPDF 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_off0000b365.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB365 15608 bytes
SHA-256: b640439ef9cfb48080fcd596be3ac9d6ae30cb8c87564688278c338d4291b397
font_01_sfnt_off0000db30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f347.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF347 10340 bytes
SHA-256: 1947ecff640fb10c55674f9e489c8440d9c1bf83f17d79e354f14b277cc18457