Malicious PDF — malware analysis report

Static analysis result for SHA-256 705b8af86c39c26a…

MALICIOUS

PDF

77.4 KB Created: 2021-08-25 05:41:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: f05b708babf89aaae2173b929edf1a75 SHA-1: f61f6b2cce85057a66493ed342acc57561e72b27 SHA-256: 705b8af86c39c26a114d551b3e2d42641a0486ba512c3cadd5a403ababa3a0d7
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to PDF files hosted on compromised WordPress sites. These links are likely designed to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • 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.
  • 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://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160aab2404b877---gokuwavoguxovujez.pdf In PDF document text
    • http://lotusromeo.fr/app/webroot/files/userfiles/files/jijepozidadis.pdfIn PDF document text
    • http://polskienarty.pl/data/aktualnosci_imgs/file/renuzaxorofob.pdfIn PDF document text
    • http://studiofantino.it/userfiles/files/votajida.pdfIn PDF document text
    • https://wittnebel.dk/file/81068342782.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081cd2ed5d45---60616383768.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c37656c686f---ranifukofojokekuwo.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16076383ee459c---51686964359.pdfIn PDF document text
    • http://mywayrtk.info/userfiles/file/4670694834.pdfIn PDF document text
    • http://amghanoi.com/images/ckeditor/files/jodivi.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9c36004bf---97227065190.pdfIn PDF document text
    • https://247hvac.ca/fabulous1/uploads/files/82402464322.pdfIn PDF document text
    • https://www.oalysa.cz/ckfinder/userfiles/files/pokufarepasuziso.pdfIn PDF document text
    • http://chataphan.com/file_media/file_image/file/lomujewodelapilu.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160d25340cc3dd---vibatenejomedusegabam.pdfIn PDF document text
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/nawegatidufawugarebanilul.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/panesakidoto.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c8614c522ea---93120736296.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c352275d3c---malad.pdfIn PDF document text
    • http://cu-hinothai.com/ckfinder/userfiles/files/63045946559.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/sanivejebajada.pdfIn PDF document text
    • http://dmkaudit.sk/101/upload/file/23941656359.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/vivadabuvekag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=it%27s+been+so+long+violin+sheet+musicPDF 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_off0000ce25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE25 10708 bytes
SHA-256: 04f4cd9955e91a8c117e572dfad0f5883b718931e4975a9131a0b0fc1b5f2b97
font_01_sfnt_off0000e6a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A1 16008 bytes
SHA-256: 253393dc6c8e3ef3a44f45565b8d4c6e5aad3bc41677c12c0be8a8509ba77810
font_02_sfnt_off00010ffc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1