Malicious PDF — malware analysis report

Static analysis result for SHA-256 6132133571e1daef…

MALICIOUS

PDF

86.6 KB Created: 2021-09-02 11:02:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d682e0a46411c9303f7f43398ba89885 SHA-1: c2df80e06e65d64d16dbb15b9a9bb95be65dc444 SHA-256: 6132133571e1daef6efc5b395aa5f381857c5cce5cb27fa5c58d84f0bb8af198
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external links, with several pointing to compromised WordPress upload directories and other disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites. No scripts were extracted, but the link farm structure is a common tactic for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://webshopplus.nl/app/webroot/files/userfiles/files/13025716293.pdf In PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606c921cd3701---rawowomolaje.pdfIn PDF document text
    • http://natproperty.com/userfiles/files/37511368220.pdfIn PDF document text
    • http://sanga.asia/userData/board/file/80466702048.pdfIn PDF document text
    • http://mofrantech.com/userfiles/file/26064814651.pdfIn PDF document text
    • https://weddingitaly.jp/images/file/susij.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/2120551389.pdfIn PDF document text
    • http://orosweb.hu/ckfinder/userfiles/files/fijajujewufodelibujo.pdfIn PDF document text
    • http://srub-servis.ru/userfiles/file/75602991581.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160afc4f805ba5---58964985305.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/0ff28b53890c1ddb14076280282f54c2/97691167543.pdfIn PDF document text
    • http://thankschicken.com/uploads/files/81493598264.pdfIn PDF document text
    • https://hotelexpert.ro/uploads/files/14053647362.pdfIn PDF document text
    • http://www.mamafoundation.cz/ckfinder/userfiles/files/5725337605.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4b3162598e---21039300070.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e731ae88eda---geluvidapop.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/14577311902.pdfIn PDF document text
    • http://nusratali.com/userfiles/files/21540825379.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/67c59cb0a82da2fd12d78e52a2aba187/tejotetuwibeladelet.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/20218302150185200.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/4vqv5a187ufcjgkmr7k0nhagno/ruvuxabidonoboboninafa.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/68161770920.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c6915adf090---97379532931.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed390b4d55---31947111520.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=expected+outcomes+for+impaired+gas+exchangePDF 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_off0000ed4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED4C 17312 bytes
SHA-256: 458ce9da765d41a0d71e152572345a392b9ce4f0d84e494ae1b7f4c0b4285cfd
font_01_sfnt_off000119ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119ED 11208 bytes
SHA-256: 58f81c3c02e95ae2fa4266efa62c02330a5d5be70ec610470bbbd90b86838a23
font_02_sfnt_off000133c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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