Malicious PDF — malware analysis report

Static analysis result for SHA-256 222279da26fc3a0b…

MALICIOUS

PDF

80.8 KB Created: 2021-09-09 03:45:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: f427f8b45956922eab72ac8e59bf3345 SHA-1: 6e4dd5f02ddab8b97d00010a7797343aca672b47 SHA-256: 222279da26fc3a0b8432294cbc8abc035f5be06594363019c251b06385545b0c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it contains a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting an attempt to distribute malicious content. The document body, though heavily obfuscated, contains elements that hint at urgency lures, reinforcing the phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/161378f7bc7128---56546905815.pdf In PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613032b8d034b---nesinoxevezewe.pdfIn PDF document text
    • https://centrorevisionimonregalese.it/file/62523947648.pdfIn PDF document text
    • http://diadiemvui.com/upload/files/71504869335.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138d896bb014---45098313212.pdfIn PDF document text
    • http://vanlysecurity.vn/vanly/album/files/74552795919.pdfIn PDF document text
    • https://sikahaiphong.com/images/news/files/88605891911.pdfIn PDF document text
    • http://top1np.com/ckfinder/userfiles/files/luzezagunowijopuxujuxe.pdfIn PDF document text
    • http://impressivetravelvietnam.com/upload/files/97155770671.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/nagoxevug.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/ns67gvvcv4bm4cmoq7krqnnten/16177109358.pdfIn PDF document text
    • https://menu2uplus.com/images/file/dofejizirera.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/28964698470.pdfIn PDF document text
    • http://turningpointdigital.com/cote_dor_import/admin/ckfinder/userfiles/files/67248594628.pdfIn PDF document text
    • https://stoneappeal.in/FCKeditor/file/xalizus.pdfIn PDF document text
    • https://bednidhitraders.com/userfiles/file/wavalalejikabepurugu.pdfIn PDF document text
    • http://happy-land.hu/editor_up/nuzukubi.pdfIn PDF document text
    • http://paglialonga.it/userfiles/files/jegitarupogakimelaxur.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/sunagulijovut.pdfIn PDF document text
    • https://christianklein.eu/Quansis/ckfinder/userfiles/files/zofogor.pdfIn PDF document text
    • http://fuoriscena.eu/file/liviferijep.pdfIn PDF document text
    • http://haiannweb.com/uploads/files/pitatir.pdfIn PDF document text
    • http://lnhaihui.com/userfiles/file/20210903195340_101470519.pdfIn PDF document text
    • http://kbidc.kr/upload/editor/file/1631069029.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=chemical+equation+of+burning+of+natural+gasPDF 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_off0000d7cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE2 11200 bytes
SHA-256: a857484fef891e0d7459e2a28adef68e0059c9fd6d5fc52eae0cbf3acfa14a55
font_02_sfnt_off0001099b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1099B 16784 bytes
SHA-256: b20d7c6cd9188ef9cf11c56c8ac5b3d21e8299754fcd4e4af4355494d692657c