Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc556ebc872584fb…

MALICIOUS

PDF

74.4 KB Created: 2021-09-22 10:19:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 067d6fae468f05ad0bf7cf85ecb2e883 SHA-1: 1f08750046a9aef82d5f5d42f6e50e34f8d010e6 SHA-256: dc556ebc872584fb706e834e5a8c4776d9c57f5a2c7136e92c79141c9c018286
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL patterns suggest a phishing or malware distribution attempt.

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://cngwalk.com/fckeditor/userfiles/image/15667287482.pdf In PDF document text
    • https://theshamrockpublecco.it/file/19395398369.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/48967982256.pdfIn PDF document text
    • http://vikingpaint.com/user_file/file/xepinipi.pdfIn PDF document text
    • https://irrisyst.eu/files/file/97224627304.pdfIn PDF document text
    • https://olgunbey.com/upload/ckfinder/files/vumigugugemagise.pdfIn PDF document text
    • https://opescom-store.com/uploads/FCK_files/file/55327598005.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1613e994fd5f98---palumijabipos.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613f3ff2640dd---roxamixet.pdfIn PDF document text
    • http://swaptoys.org/ckeditor/uploads/files/95526458072.pdfIn PDF document text
    • https://loffoxfitness.mvwebsolution.com/userfiles/files/forute.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1614755fbaa5c4---jefinidorawut.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/97788207488.pdfIn PDF document text
    • http://lenosada.sk/editor_uploads/files/vuvidanevenoburujexuzitib.pdfIn PDF document text
    • https://www.traitagri-solutions-alternatives.fr/ckfinder/userfiles/files/legafewumo.pdfIn PDF document text
    • http://osc-pribor.ru/products_pictures/file/34018697655.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1614ad62771157---83969211369.pdfIn PDF document text
    • http://nwatchonline.info/userfiles/file/93301349552.pdfIn PDF document text
    • https://red-adlay.com/upload/files/77976418738.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/161331af8d6ffc---96850833043.pdfIn PDF document text
    • http://rent-lease-no1.com/userfiles/file/20210908155347.pdfIn PDF document text
    • http://etasystem.net/userfiles/files/pasimu.pdfIn PDF document text
    • http://virtualcharityevents.com/vce_cake/files/files/84475166272.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/12050250713.pdfIn PDF document text
    • http://picart-personal.pl/fckupload/upload/file/63845088656.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=2+timothy+commentary+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_off0000c0fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d90d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD90D 16484 bytes
SHA-256: 5dcb0955bfc5ce7566a5718fae2701d47c332d70e18a2a4f4e4d76ff8377cc37
font_02_sfnt_off0001035c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1035C 10808 bytes
SHA-256: f7e72d083aa324112b497287d09254980182fc855964e76ee60a5393591eff37