Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdfed6354c9c5a22…

MALICIOUS

PDF

82.8 KB Created: 2021-09-12 07:08:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8e0476c363b9f64e46f6ea2fe555189c SHA-1: 32781fdc5823cb999e90cdc99f2d1d6c8f1f3216 SHA-256: fdfed6354c9c5a2240691b97fcb819985d447f2c91eb4bc555737ec8ac7cce66
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS upload storage and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://allytemp.ru/uplcv?utm_term=beauty+and+the+beast+short+story+pdf PDF link annotation
    • https://suavitinhtannha.net/upload/files/48993799284.pdfIn PDF document text
    • https://sapsda.com/SapmaUserfiles/file/zisoxo.pdfIn PDF document text
    • http://quangcongluc.com/upload/files/39973735226.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16134cb7f40fae---27496068212.pdfIn PDF document text
    • http://olympiad-bigben.ru/ckfinder/userfiles/files/kodufof.pdfIn PDF document text
    • http://studiotecnicofrisoli.com/userfiles/files/77427135196.pdfIn PDF document text
    • https://shian-jin.com/UserFiles/files/15182031635.pdfIn PDF document text
    • https://shidoremicrosys.com/media/76972664854.pdfIn PDF document text
    • http://op-gold.com/ck_image/files/33881254600.pdfIn PDF document text
    • http://thienthaopc.com/upload/FCK/file/xipivubalaruwov.pdfIn PDF document text
    • http://www.vinoplaza.nl/img/upload/files/denoxozedivamokuti.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/3k7kuf5sr6663rjocb186476t9/bidowamodilasiti.pdfIn PDF document text
    • http://jiab.net/userData/board/file/tofululituw.pdfIn PDF document text
    • http://saltokisport.com/uploads/files/57199631639.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/2uap3qabm83t9g7lhfp7jdfe1i/gedanirafijunumenagako.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/bimawepitokuvetupusaletu.pdfIn PDF document text
    • http://traktor-tv.de/sites/default/files/file/rubawugigunaxedaxogomule.pdfIn PDF document text
    • http://reckdance.pl/userfiles/file/rodebifotujinojol.pdfIn PDF document text
    • http://zoldjogsi.hu/uploads/files/wubovovowonuludo.pdfIn PDF document text
    • http://helenhotel.vn/upload/files/14905197865.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1612fef717a4b6---jefizarizi.pdfIn PDF document text
    • http://fra2ange.it/userfiles/files/zapokidobejudolusobe.pdfIn PDF document text
    • 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_off0000dca7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA7 18220 bytes
SHA-256: eccb364d9a875ee35c693e9e5d9255bd55399420a153c036c9415caa2c901173
font_01_sfnt_off00010c28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001243f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1243F 10864 bytes
SHA-256: ff321fc55c7ded7b2c106157828e05c76aa7c2b6f4869b6ce67a660f7e0f78b1