Malicious PDF — malware analysis report

Static analysis result for SHA-256 21ebf6c54f19cbe0…

MALICIOUS

PDF

83.9 KB Created: 2021-07-08 23:49:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: 80e0d0fd229f000ecc99b09edfcb7e4e SHA-1: bc14de7a6c7822cf8592dc18cd0457d2ec48b4cd SHA-256: 21ebf6c54f19cbe02496081748896b3a9d03e603e40c03030d3d55efe6b77715
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous links pointing to compromised WordPress upload directories suggests a link farm designed to obscure the ultimate destination, likely a phishing or malware distribution site. While no scripts were explicitly extracted, the PDF structure and link farm indicate a malicious document, potentially used as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/b33daea2b1882db3678f8087dd81aeb5/43067032846.pdf In PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f440217e1d---27665337346.pdfIn PDF document text
    • https://thuaphatlaihoanghuy.com/uploads/files/dabase.pdfIn PDF document text
    • http://greaterdeliveranceministries1.com/clients/61527/File/xipatilizadapolipit.pdfIn PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/bebbb2493f4e0db9114152496674b134/61045595372.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff27912c55---laputudiful.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608718eb70f27---lupak.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e00c62dddb6---fomimumumavev.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/3kb14o8aphg2gk8eh0lbo3snvk/nelenodi.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/zademomivut.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/9829b079d740a7fb487ba44ee56a7b85/voderafaroditukaf.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/14663753339.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/59295945151.pdfIn PDF document text
    • http://phunggia.biz/userfiles/file/wazojagazasoxotev.pdfIn PDF document text
    • http://delve-cr.com/uploads/9150723913.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1dad34a941---powugepaboxizod.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/b5122e7becf96a803557a6e7d58333d1/83795402350.pdfIn PDF document text
    • https://tonwen.org/userfiles/file/rorivikerovomokesebali.pdfIn PDF document text
    • http://fuga-hotel.com/CKEdit/upload/files/94998426643.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb37bab8b9c---26096279458.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608535b5a44db---sebuxuvomorenuvetusoresok.pdfIn PDF document text
    • https://craftsmancuttingdies.com/wp-content/plugins/super-forms/uploads/php/files/f6ur16vcs47d0olj5etm07d00m/33320670116.pdfIn PDF document text
    • http://igabana.com/upfolder/e/files/20210618054419.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=ibps+office+assistant+book+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_off0000e24e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE24E 17652 bytes
SHA-256: 8d04c4d6e40552f20afc92f486ed449f7bc0359c76d8abb6ea6a1e9c42001491
font_01_sfnt_off0001109d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1109D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000128b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128B4 10652 bytes
SHA-256: 493c9b401141b294059ab87f081889d94cca91099ddb2846980ae073289db2cf

Open this report in the interactive analyzer, or submit your own file for analysis.