Malicious PDF — malware analysis report

Static analysis result for SHA-256 d03aba4c8fa2e9a7…

MALICIOUS

PDF

79.4 KB Created: 2021-09-06 23:31:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7c1d26510d887c450e34ef27635ecb0d SHA-1: 6acb0c53ccb9757f4493a3f4aa997b5876c7fc4f SHA-256: d03aba4c8fa2e9a711f8736a6a27c1b90c658f6fbebd0c6f2ee00438556f08ec
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users. The presence of numerous URLs, including those hosted on compromised CMS uploads and disposable hosting, suggests a link farm designed to obscure the ultimate destination and potentially distribute phishing content or malware. The primary attack pattern appears to be leveraging the PDF as an attachment in a spearphishing campaign to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pixomot.ru/uplcv?utm_term=lcm+and+hcf+worksheet+for+grade+5 PDF link annotation
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/5501f3383c930d2e7bdcdfc01a762217/91787479257.pdfIn PDF document text
    • https://sgicorp.com/userfiles/files/tugowujozobaxisowurawu.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16114f0a2d38a5---xifinonevedidizilefenu.pdfIn PDF document text
    • https://easypayindia.in/userfiles/file/78713275545.pdfIn PDF document text
    • http://parejalecaros.com/adjunto/upload/fck/files/bixegogimazufira.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/3777502ae18795713e7180f1802298ae/84649378722.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4826095ae0---jefiwujalopobazatiwibida.pdfIn PDF document text
    • https://panama4d.com/contents//files/kefixiludugaxexujelewa.pdfIn PDF document text
    • http://empezo.xyz/js/ckfinder/userfiles/files/vijaziwexoxuretuvux.pdfIn PDF document text
    • http://cokhilegia.com/upload/files/43045536730.pdfIn PDF document text
    • https://didacostruzioni.it/userfiles/file/79506355992.pdfIn PDF document text
    • https://keongracun.org/contents//files/noduxumazamubog.pdfIn PDF document text
    • http://abroadster.com/files/memifipowedafemudewipul.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b2455ea4b---1733087980.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc74ae8fd78---rimofisugifam.pdfIn PDF document text
    • https://hoongnau.com/upload/files/xosezurosuja.pdfIn PDF document text
    • http://highlandcougars83.com/clients/2/26/268573c5102cd00412bac87cee9346ec/File/4158369575.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/narekara.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b0bc806e60c---gupojunesike.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/28c482f6df06138809abbbeaa005d354/61751466593.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb19d880ca3---kujubuneduviminuv.pdfIn PDF document text
    • http://cy2hand.com/userfiles/mutiwitejaxajexotiworema.pdfIn PDF document text
    • http://studioaeditecne.it/userfiles/file/forasamuxipoxozage.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/qhebg1bf2r01mtj0lqq78bpf8b/99106726809.pdfIn PDF document text
    • http://trungtinjsc.vn/upload/FCK/file/97089578158.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_off0000d285.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD285 11052 bytes
SHA-256: 1020d8145d5a47ef2e8e6af963e8ce1d4a69967027af9a1fcd7835beab8f678e
font_01_sfnt_off0000ec04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010416.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10416 17188 bytes
SHA-256: c806891d3daa638fffd777d354b18d8f9f2ca1e6f613a1bc23fb4bb2fbdec234

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