Malicious PDF — malware analysis report

Static analysis result for SHA-256 3273b7d7e10c23a0…

MALICIOUS

PDF

80.7 KB Created: 2021-09-17 08:47:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9cca635eb90306d82013ee0998894483 SHA-1: abf08f3b5cb0a26dcc8320143101d5b8dd87c929 SHA-256: 3273b7d7e10c23a0f945eb2e0cb895c8f38fdc908a3de3b253ad3b0f8876391a
156 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by ML classifiers and ClamAV. It contains numerous links pointing to compromised WordPress upload storage and disposable hosting sites, suggesting a link farm designed to redirect users. The PDF's structure and the presence of these links indicate an attempt to deliver a malicious payload or phish for information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://lsneotek.com/ckupload/files/zewavaga.pdf In PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef28ac89b2---7025803347.pdfIn PDF document text
    • https://implantsdentairesdesmoulins.com/upload/editor/file/vevinizoxajifujif.pdfIn PDF document text
    • http://fairfresh.net/assets/admin/ckeditorimage/files/12944174861.pdfIn PDF document text
    • http://indyskischool.com/ckfinder/userfiles/files/88226566792.pdfIn PDF document text
    • https://webmakler.org/userfiles/file/kifinarobeku.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16132a29990c3c---50753043439.pdfIn PDF document text
    • http://grupophi.es/uploads/files/86551732348.pdfIn PDF document text
    • https://izyskately.ru/foto/ck/files/koziraredotedimofapal.pdfIn PDF document text
    • https://pr-dienst.ch/file/wivevuxoduzuxefebereg.pdfIn PDF document text
    • http://maximaviajes.com/FCKfiles/file/goturuturefazexa.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/4a825c62abbdc906cc0f331d9c063880/34742755923.pdfIn PDF document text
    • https://garraldaarquitectura.com/garralda_userfiles/files/62475368756.pdfIn PDF document text
    • https://angel-juicer.com/FileData/ckfinder/files/20210903_FC4F233EA95AA709.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a6bedae2c2---newujenofopom.pdfIn PDF document text
    • https://ispartaorganizasyon.com/ckfinder/upload/files/jiveg.pdfIn PDF document text
    • https://phr4u.com/files/49613081719.pdfIn PDF document text
    • https://thebottombillion.org/business_school/uploads/file/vukixan.pdfIn PDF document text
    • http://bangdinhphucat.com/quangbasanpham/app/webroot/upload/image/files/37092407366.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136121ece593---33976666575.pdfIn PDF document text
    • http://plenerowe.kbo.pl/ckfinder/userfiles/files/bikudusugagemiv.pdfIn PDF document text
    • https://redac.ch/upload/wisenozifipugu.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16134bd54a6429---sejukemipokorew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=she+will+be+loved+guitar+chordsPDF 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_off0000d48d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD48D 17900 bytes
SHA-256: d45b32f07c85aa7166dcf2dc4399133033e7d8d3c0e2534b5cab6e34a481512c
font_01_sfnt_off00010344.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10344 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B5B 11012 bytes
SHA-256: 0eeb7f7c698e7eaf9cd93235a8c540c75007105189069d37ccfaabb994221267