Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffae76a9d520d615…

MALICIOUS

PDF

80.8 KB Created: 2021-08-23 17:43:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c1c7d28e2300b750af26a3a2f83a020b SHA-1: 3ddb85aa2c2c8172249f975a52de082f6d5fdf4d SHA-256: ffae76a9d520d61569a33b19ecaa3e2dec406fc63a40985e6f92867408dacfd0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://nocenzura.space/web/img/podborky/files/kuniraxodarufulifagenuf.pdf In PDF document text
    • https://muguet.fr/sites/default/files/file/27719586911.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/5ccc1bd6c4c48d8f6dad7b8e328acb75/toferat.pdfIn PDF document text
    • http://www.77ice.com/upload/files/filorerolodan.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/mocbg87um1lb2sv2v8sg61qvv5/daparepafepu.pdfIn PDF document text
    • http://www.dereformasenalicante.com/archivos/files/xetafumazupaz.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/58718740654.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file///37723679630.pdfIn PDF document text
    • http://www.tamtrebinhminh.com/public/files/66275666555.pdfIn PDF document text
    • http://svaz-podnikani.cz/files/file/7408163644.pdfIn PDF document text
    • http://goddesshair.net/upload/users/files/89306131518.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/ea6283127cb85ec0b6d6987b27f6b582/jotador.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e15e823b572---93616142579.pdfIn PDF document text
    • http://mahlkoenig.nl/app/webroot/files/userfiles/files/belinizakunixigobevigu.pdfIn PDF document text
    • http://iseveranscopy.com/upload/editor/file/fepokinujimu.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1610022ceb7fc5---sunujejovoroludutipuma.pdfIn PDF document text
    • https://mokhalasati.com/userfiles/files/ragivukuduwamizi.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe259730bbb---45218739085.pdfIn PDF document text
    • https://chauphongasia.com/wp-content/plugins/super-forms/uploads/php/files/e4omkfurf9nb5fhlgq7fpqlm2o/8303378235.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/c47eb80006e956a8df63be8968319b57/54623652964.pdfIn PDF document text
    • http://dieta-plus.pl/userfiles/file/nepigagiseradex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=how+long+does+it+take+aids+to+kill+youPDF 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_off0000d8f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F4 16668 bytes
SHA-256: bab24d2ce09ec25e76fe5b76a1a1bb92b07ad5aae3ab32b1c5cea0a1813eb679
font_01_sfnt_off0001046a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1046A 10704 bytes
SHA-256: b6ad34a207c30b5e8b1394ff6f3e4682745e5f6c360b7024c45519dd894f2b21
font_02_sfnt_off00011cf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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