Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b2086b0a8ba07fb…

MALICIOUS

PDF

88.1 KB Created: 2021-09-04 14:18:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 805faad0b43893e6a53223a3c9ba9676 SHA-1: 14fe2b4ccf74e9694f662153172217ee59240b86 SHA-256: 7b2086b0a8ba07fb9fb668ed76cfda51d83350943ec5e2c2e2de46cfe5d52a07
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, suggesting an attempt to distribute phishing content or malware. The presence of multiple links to compromised CMS uploads reinforces the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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 https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c7be1816b5d---lejotaxerexegimeli.pdf In PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/dubujawaviravabepij.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/8j2h07en025sbrgfftfjmlj59l/jefizo.pdfIn PDF document text
    • https://rlmahtani.com/userfiles/files/xedaselusejafexox.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160add70a1d08f---30104627172.pdfIn PDF document text
    • http://www.pranabkumar.com/fckimages/file/94133429811.pdfIn PDF document text
    • http://gibisch.biz/files/files/miruzu.pdfIn PDF document text
    • http://cwesp.biz/upload/file/97475808644.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16081f39606667---40908010586.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071c45c77f0d---lolamir.pdfIn PDF document text
    • https://www.padanguparduotuve.lt/ckfinder/userfiles/files/11778784087.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/58e148a260cf05a34a70cca0e418dab5/rabepenutifuwi.pdfIn PDF document text
    • https://magicdiscoradio.com/userfiles/file/zanawajaxuk.pdfIn PDF document text
    • http://50wj66.com/clients/a/af/af9d65f11c1965a5434adcd4cd578f00/File/21117169126.pdfIn PDF document text
    • http://coreaad.com/DreamDataUpload/file/faforomale.pdfIn PDF document text
    • http://ciskmv.com/css/file/68116517107.pdfIn PDF document text
    • https://e-ceramika.pl/userfiles/file/67250127977.pdfIn PDF document text
    • http://secretinvitation.net/images/files/reradi.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/5d6461e200f6e0a69c69cfae28fcafa7/miromavaguweliladeti.pdfIn PDF document text
    • http://thehigh86.com/clients/13680/File/51980304202.pdfIn PDF document text
    • http://hasdeu.md/data/userfiles/files/jolifevopixorexova.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608e756119e00---jipidaminipemadedazuvof.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609a204844d86---goxomewaziboli.pdfIn PDF document text
    • http://www.enfersalus.com/ckfinder/userfiles/files/88500780559.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/11018531858.pdfIn PDF document text
    • http://savalis.ru/userfiles/file/febefiweg.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611e435bc2c57---78406337484.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=44th+constitutional+amendment+pdfPDF 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_off0000f203.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF203 18164 bytes
SHA-256: edf6e40cf0cf3be2630c338ceab847cf4504d16c3b305edb61e0459e4071fae2
font_01_sfnt_off00012154.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12154 10868 bytes
SHA-256: aaba7017b59b40dab1524ca5e42a5baf77b02f48f90cdccf08127dd4856b7b96
font_02_sfnt_off00013a3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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