Malicious PDF — malware analysis report

Static analysis result for SHA-256 56edc0239db20226…

MALICIOUS

PDF

76.7 KB Created: 2021-08-18 16:10:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9d492f375a2c19cb7dce989950945982 SHA-1: 697733f9422f15df243a4e400d1d02c183003101 SHA-256: 56edc0239db20226df61d929accd4239f161faa2c5ef38d90101514ab3d90ab4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various websites, many of which appear to be compromised WordPress installations used for hosting the PDF itself. This pattern suggests a link farm designed to obscure the ultimate destination and potentially evade detection. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/ipn3coabbhdnvqcbb68rq8psd2/28824015966.pdf In PDF document text
    • http://nacyc.jp/Upload/file/54562555292.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1a1ded8e11116877a4a6a4a4a936ea2e/wojog.pdfIn PDF document text
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/764b806793ed83ea54d69b86a20e3097/59760587302.pdfIn PDF document text
    • http://farmaciafoglia.eu/userfiles/files/40344201236.pdfIn PDF document text
    • https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/dc3ffaa0becfad8c0939f0f7333f48dd/62434255316.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/33431453586.pdfIn PDF document text
    • https://twinslock.com/ckfinder/userfiles/files/46610813799.pdfIn PDF document text
    • http://sp3siemianowice.pl/userFiles/files/ziforamovematu.pdfIn PDF document text
    • https://music-group-store.com/upload/files/vebodivodi.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/fifusufumomaxo.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/68c793e05c35caf8ed605254a625b204/57431636154.pdfIn PDF document text
    • https://senhewood.com/d/files/makomevutidegezazodorag.pdfIn PDF document text
    • https://fullmagicweekend.com/ckfinder/userfiles/files/75374123585.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/mesolasenijak.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/470f8afd230a338ebb0536f589d4bf6e/94112794250.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/54e6ed4b31f7f89ba02f2361ce6f2d14/43806671928.pdfIn PDF document text
    • https://webmenuplus.com/images/file/17763172642.pdfIn PDF document text
    • https://www.agcontraincendios.es//ckfinder/userfiles/files/dajadadap.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/42304392928.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160959abfa786b---nonezigixotow.pdfIn PDF document text
    • http://islandpointfl.com/userimages/57169669170.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=hotel+praia+cachoeira+bom+jesus+florianopolisPDF 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_off0000c3d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3D0 18640 bytes
SHA-256: 8839b9cb11a4b72b85c6e7b304b1d08e098bedecdd982471eef5ee5406149724
font_01_sfnt_off0000f18e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF18E 11108 bytes
SHA-256: 5d86478655ac87c0f50dc014edb007be143877600491d3a3461333df25f29a46
font_02_sfnt_off00010afb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AFB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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