Malicious PDF — malware analysis report

Static analysis result for SHA-256 f48e2bc4feb82469…

MALICIOUS

PDF

92.4 KB Created: 2021-08-01 05:55:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 704083ad010859620c645556bff0a88c SHA-1: 77d8ddb367dc5b1b2c5a3c227cc65062ee38aecc SHA-256: f48e2bc4feb8246957a89dc44a270a35314e6f4f5b026faa122d524cecd6a624
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links, many of which point to compromised WordPress sites. These links appear to form a link farm, likely intended to redirect users to malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, consistent with a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbb4cb4cf50---23598885841.pdf In PDF document text
    • https://www.auto-ecole-acm.com/ckfinder/userfiles/files/62501995589.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/t7vb9hpvq0j8utsv6t6g2pm2lq/rafilonuxorulejarexemezi.pdfIn PDF document text
    • http://losmarinoslanzarote.com/marinarubicon/admin/file/zomuwafexeremorokag.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/zolelimomuzifumegovapi.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c7aa6207910---sadowovotudesekakejubowi.pdfIn PDF document text
    • http://ellev.fr/upload/files/voropinomobasexofufav.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0a05da052c.pdfIn PDF document text
    • http://laihoawedding.com/app/webroot/upload/files/82047930156.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/te6iq1pm5lhj47an17noesg5e4/xeriwamowolikiju.pdfIn PDF document text
    • http://cbwmd.com/uploads/Files/vopumovujaloturuzawuno.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16080bdfa17573---6870635291.pdfIn PDF document text
    • http://metallpress.info/files/pijem.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/cl65qhom34eb0gdtirhjugcaof/duxutomewavatakowakifod.pdfIn PDF document text
    • https://arch.ua/ckfinder/userfiles/files/98512601957.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c542210383---37355541080.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a0715724930---nalagijilisolotata.pdfIn PDF document text
    • http://mindentudor.hu/userfiles/file/kagujegevega.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/gixitodetog.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ec5e677059---serogoj.pdfIn PDF document text
    • http://garmagostaran.com/Upload/file/94840151973.pdfIn PDF document text
    • http://vdtonline.vn/static/uploads/editor/files/7307527866.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16076ebcc29801---xobume.pdfIn PDF document text
    • http://thankschicken.com/uploads/files/luxijulemoruwu.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/texixukekuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=dibujos+de+dinosaurios+para+colorear+e+imprimir+gratisPDF 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_off0000ffde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFDE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000117f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117F5 11228 bytes
SHA-256: 9dd3e6fa760c8261bb7f2a5f7239662ab49616b24aab0be39b23961e1961fa15
font_02_sfnt_off000131ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131CE 18344 bytes
SHA-256: c1a0a8753c1f1e2da5efa156f1d6ce263fb0ad9d3113fa7ba39a3575fc76a492

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