Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed7b820a4ad48820…

MALICIOUS

PDF

86.6 KB Created: 2021-09-03 16:42:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1678b12e13467baa771b606ed3e608b0 SHA-1: 457b0b8ee55cf4056d276de5b856a5a707ed109b SHA-256: ed7b820a4ad48820333ec54bec5e0074fb861162e37db6fa6eb043ea25facaf8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised websites, indicating an attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/75b1ea7431f638fa4519bddc898d143a/xepunusifadaweb.pdf In PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608cdf1932006---76967595080.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/eb915eeeb09ad6544649fea8fe1a8956/90472879439.pdfIn PDF document text
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/24141813395.pdfIn PDF document text
    • http://mrspk.com/ckfinder/userfiles/files/63932023527.pdfIn PDF document text
    • https://sskundal.com/userfiles/file/latewabel.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f347169a673---67234135361.pdfIn PDF document text
    • http://klubalfa.org/img/userfiles/file/7130146462.pdfIn PDF document text
    • http://ventilatoryzlin.cz/images/file/xulogerizuzaxax.pdfIn PDF document text
    • http://oiseau-bleu-morzine.com/userfiles/file/8081540057.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/7b9298e344ef2e3f31fc3a2c63a32d7a/wimivujukidiromukigawir.pdfIn PDF document text
    • http://www.nomorcantikjoss.com/file/punemurolawosetefavijuzig.pdfIn PDF document text
    • http://datavincity.com/uploads/ckfinder/files/15937113265.pdfIn PDF document text
    • http://chronicles.ae/userfiles/files/52132717315.pdfIn PDF document text
    • https://habibitours.org/ckfinder/userfiles/files/nalisixanonife.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/13103037349.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/c2db6049b72112cb72fd7377d75cf616/46264588938.pdfIn PDF document text
    • http://goldenpeak.it/userfiles/files/87824252227.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611a2f397fad9---xelimabanixodudetelotel.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/8b8bee02b836b5244d259b6380a35a02/11421523090.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612c82620540b---28610937722.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/i3c75pq3ld06ncl08otl84mo85/47928144098.pdfIn PDF document text
    • http://villabrown.it/userfiles/files/zetuvujiza.pdfIn PDF document text
    • http://mobilephleb.com/clients/2/2d/2d2188d13063160162e6e2bbcdac547d/File/tugujafowifejosu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=van+halen+pretty+woman+tab+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_off0000ecaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECAA 18640 bytes
SHA-256: b00a2357d157e74de9d5053af8959143aa75a5cf4d8c206a3a4e23b973e3944d
font_01_sfnt_off00011c0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C0A 10812 bytes
SHA-256: 1fa1207841ac7e003bd2e8997fe2799fa16c77e5ec652f1a4ce829cb923b443f
font_02_sfnt_off0001349e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1349E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1