Malicious PDF — malware analysis report

Static analysis result for SHA-256 a545b5e2b72a35da…

MALICIOUS

PDF

82.4 KB Created: 2021-09-14 00:18:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2e097ff98b40f3a024406e7e51985c07 SHA-1: 7f8fc0c6aeb6fb6b6b8e9aae4b61d5629c657c11 SHA-256: a545b5e2b72a35da3e49f18a85a51394d155b93afa13ef526a48007762d99ed7
164 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links to compromised WordPress upload directories and other potentially disposable hosting, suggesting a link farm designed to host or distribute malicious content. The presence of a 'download' button heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/161319540864c1---tawatuxaloxexezivube.pdf In PDF document text
    • http://tensoinox.com/userfiles/files/94832956973.pdfIn PDF document text
    • https://52fantasies.com/home/holly/public_html/ckfinder/userfiles/files/papegidadexezasa.pdfIn PDF document text
    • http://fskyok.com/uploadfile/files/76455086242.pdfIn PDF document text
    • https://dichvumoinoi.com/ckfinder/userfiles/files/53393979930.pdfIn PDF document text
    • http://energyexcess.com/userfiles/file/fotuzatoropekosofad.pdfIn PDF document text
    • http://gazduire-domeniu.com/UserFiles/file/56739394341.pdfIn PDF document text
    • https://indiachristian.org/uploads/files/ganameleteluwupimewibe.pdfIn PDF document text
    • http://efuturesthai.com/uploads/file/31065826457.pdfIn PDF document text
    • http://fge-service.com/userfiles/file/tapozusorek.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fbdbd7e7fe---54850908342.pdfIn PDF document text
    • http://kubabus.cz/novy-web/upload/file/75547257009.pdfIn PDF document text
    • http://savitapiti.org/ckfinder/userfiles/files/26926714864.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/c10d593719e7a5db114cae4cb8b2ae2e/zameketogagivuvinujezuzo.pdfIn PDF document text
    • https://organicearthfiji.com/documents/file/49203706145.pdfIn PDF document text
    • http://chinalabware.net/d/files/98421794658.pdfIn PDF document text
    • http://tatugigo.com/ckfinder/userfiles/files/7671684900.pdfIn PDF document text
    • http://groupementpecheduloir.com/ckfinder/userfiles/files/viserologivebekobaji.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/pigiv.pdfIn PDF document text
    • http://kolbiko.com/images/uploads/file/nufon.pdfIn PDF document text
    • http://turningpointdigital.com/cote_dor_import/admin/ckfinder/userfiles/files/33649471148.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b8618ad84a---jatugovapibizisonewu.pdfIn PDF document text
    • https://kirmatas.com/userfiles/file/68066653220.pdfIn PDF document text
    • http://zaintik.org/files/galeria/files/nanusawoje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=cricket+2019+apkPDF 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_off0000decf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDECF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E6 10512 bytes
SHA-256: 110ae74280fd1b2e1edc5b447a1541aa7be1022066abcf422177363686195a5f
font_02_sfnt_off00010f21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F21 17500 bytes
SHA-256: f6f91bd15a0adccd4a69b7532f2d31799b44ee510af55f0269ac5bc421eb2198