Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd1645ec8496a1ce…

MALICIOUS

PDF

97.9 KB Created: 2021-07-01 23:24:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ee7029c09c11a1df2a0565efe2ad07ca SHA-1: 1e2521b5827afc9efb1c5d318098d6edebc8a3de SHA-256: bd1645ec8496a1ced2ed822c4c3722e5a5a2fa3fa1d6e0b2bf148d4ef4f3b9fd
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous websites, many of which appear to be compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body is unreadable, but the heuristics and URLs suggest a tactic of luring users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c74fa01b44---sinuzefekewiwodisupaforu.pdf In PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b0fc3d1ccc2---67520435120.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/kazudovejofelipaxivujima.pdfIn PDF document text
    • https://surupaceanu.ro/ckfinder/userfiles/files/25318617271.pdfIn PDF document text
    • http://arisutour.com/ckupload/files/dufeperife.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1c912582dd---folamide.pdfIn PDF document text
    • http://staceyasp.com/UserFiles/file/puzubimagunalefusimib.pdfIn PDF document text
    • http://niszczeniewaw.pl/userfiles/file/wifigivubawakizimekeg.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/5hosgu4bfh44re47r1j2mff6n5/41920964860.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/eqtdb0qmo5ufc8b8k51plpf2d3/17137727405.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16070d3da9438b---zixajizotamodiwevosewet.pdfIn PDF document text
    • http://zeguvietnam.com/uploads/ckfinder/files/nesamisutororosutikuzoz.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/vavorenezika.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b5de11d96c0---73031693194.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c2be6fd26c2---bogiviludixomunozi.pdfIn PDF document text
    • https://alula.com/wp-content/plugins/super-forms/uploads/php/files/ba818782420b01ee06efb2237b8df34f/82893343575.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/415400072.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608734ad48d44---wakigudirogasokogipotare.pdfIn PDF document text
    • http://sxcec.org/userfiles/file/pumimuxalakojek.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b18b594ccd---jupilejora.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/suzituwijesuzeka.pdfIn PDF document text
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/42572280558.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=shane+from+songlandPDF 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_off00011e63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013675.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13675 17032 bytes
SHA-256: 529a0f2544537ba2705730c8937c457e42c901e70cbc88a1a9117933f6e51daa
font_02_sfnt_off000162df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x162DF 10684 bytes
SHA-256: aa699520de657c8cd017e6eaf108c7859fbf50fda945bb427dd99de60984153f

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