Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb4a113bc56cb9e4…

MALICIOUS

PDF

116.1 KB Created: 2021-09-24 11:53:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 6c68f9f9c4b200fd3e8dc2773846c691 SHA-1: 60a27745a9e20ccdfe8e0e33e9c00f64de1f8d7c SHA-256: fb4a113bc56cb9e47a28cb583a5b58d97ed707d139b9ceb5f46ae960a10bd693
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the file functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS uploads. The presence of numerous unknown URLs suggests a phishing or SEO manipulation campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://progettocecinacuore.it/writable/public/userfiles/file/ruxudifojakofafezasojapa.pdf In PDF document text
    • https://bititechnika.com/uploads/file/50650337477.pdfIn PDF document text
    • http://www.cda.org.hk/ckfinder/userfiles/files/begaxogoj.pdfIn PDF document text
    • http://ipceurope.com/assets/file/fubanonufarip.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614bcdf0f3149---35831665372.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/68423324152.pdfIn PDF document text
    • https://soechi.id/userfiles/file/56008163781.pdfIn PDF document text
    • http://sanraimundo.cl/dyn/uploads/file/tazenozokaja.pdfIn PDF document text
    • http://dhalahoredeals.com/survey/userfiles/files/94147191988.pdfIn PDF document text
    • http://architettoangeli.it/userfiles/files/1714123131.pdfIn PDF document text
    • http://creptiles.dk/userfiles/file/85328204790.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/45491571167.pdfIn PDF document text
    • https://tectrongim.com/uploads/file/gasumerugarumuritezukir.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/ff6fb8eca0b2d0ffe8aa999befcd5fe8/18481895843.pdfIn PDF document text
    • http://gidromall.ru/img/uploads/file/38829388097.pdfIn PDF document text
    • http://the-bom.kr/upfile/files/xetin.pdfIn PDF document text
    • http://happyland-nsk.net/ckfinder/userfiles/files/povoferesiset.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613108a2b0950---pigorelitusarudom.pdfIn PDF document text
    • https://ntct.dz/ckfinder/userfiles/files/6172726263.pdfIn PDF document text
    • http://sjzhtchem.com/upload/files/75006750379.pdfIn PDF document text
    • http://shyjjc.com/v15/Upload/file/20219418568673.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///kafiguz.pdfIn PDF document text
    • http://corporatiegids.nl/uploads/files/51922148526.pdfIn PDF document text
    • https://commonwealthsportsawards.com/userfiles/file/kumamifimojokuxozaxewabit.pdfIn PDF document text
    • http://st-ark.it/userfiles/files/10017071499.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=citizen+gst+calculator+pro+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_off00015a3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A3B 21080 bytes
SHA-256: 245a6ea97643efacaebb25fbcfaa4df70ac37313bde5d93aedcbe05e872e08ae
font_01_sfnt_off0001925c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1925C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001aa73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AA73 10832 bytes
SHA-256: 6a6cb94df81e349741976f2e936b69448f6ed2e63500a4db3309542ae8ff44c0