Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f4cd07c211bb368…

MALICIOUS

PDF

82.4 KB Created: 2021-09-06 15:12:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7db9460e87a044177166af6ba2afabc0 SHA-1: fb9dfb6fd181e590fb3c761f9dc2f3631b10abe1 SHA-256: 5f4cd07c211bb368eda67b5289a5e9ca0a70d1e09d0533859f3189a971e2e673
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a link farm pointing to compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the execution of further malicious actions, such as downloading a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://altelaw.com/uploads/image/file/vevuwajak.pdf In PDF document text
    • http://austria-ex.com/images/blog//file/bisulugifomowujisanuri.pdfIn PDF document text
    • http://mojahotels.com/ckfinder/userfiles/files/garuxijolag.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607049b007966---medolu.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/4qcf2pmr3ov3pgkkv1n0upnmoq/kumewifobewojivilezinigo.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610d3acf435de---gizabodijopepaz.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/bbb84a07efb5318e57884c7a1ca22aac/jinajowekazefiki.pdfIn PDF document text
    • http://bmhs1963.com/clients/7/72/7286fd37811b7a5dece6e69924e4d5ab/File/jiponijanepopi.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a28ec00f6c0---11822875333.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/n70ikmhiue98kls037nnfpkbth/kefimalemi.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/t1qpeqnkk1v3t1retq7tafp2a0/77850707037.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/pufeteter.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/3l8p7ihgti8j26efcej7r8490i/zupafurelukulejiwitetub.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/jc8qf23tv6a0gd6vbl452s3586/tuzutebiki.pdfIn PDF document text
    • http://carlaschroyen.com/content_docs/47994146667.pdfIn PDF document text
    • http://vogiantinhmach.com/media/ftp/file/85633303952.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608145e993008---33682385797.pdfIn PDF document text
    • http://park-seversk.ru/other/js/ckfinder/userfiles/files/zinekakaz.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/73203556877.pdfIn PDF document text
    • http://world-housing.jp/ckfinder/userfiles/files/wasisexisibil.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-7-13/20210713183651695453.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/3b19663282de5bcb5ec3dd2bb6e359b6/jurofagododob.pdfIn PDF document text
    • https://observatoire-omic.org/documents/file/4302301583.pdfIn PDF document text
    • https://themalc.org/files/file/42647140928.pdfIn PDF document text
    • https://ropaalmayoreo.com/images/userfiles/file/60161736838.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=pdf+scanned+copy+to+textPDF 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_off0000ddc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5DD 10592 bytes
SHA-256: 091a2e22db0f2724c72050f0f9c2146b2b6c2b8b563e7538c1c2d8376984964d
font_02_sfnt_off00010e46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E46 17592 bytes
SHA-256: cbf99fceb3150b2e6b31a709ab807254fc29298437315c65556a84158639522a