Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4eddf156174da36…

MALICIOUS

PDF

91.6 KB Created: 2021-07-01 13:38:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e90c2d9b7cfc58a138606ce0aa68b293 SHA-1: 7b3dbac4342c573be92d8be567a8bea8583a44bf SHA-256: f4eddf156174da36f79640d595582a25e52a73be5843ef425c040939bc67f012
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the embedded links and heuristic firings point towards a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/29df71301688fb95494335a4df9721b3/gafadamulasifep.pdf
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a2da61124f7---57242622356.pdf
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/6sm7e64ahdnl5mquqa4s7cp16n/sukarudapamugojoremexira.pdf
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5ef647862f---sibuwifopodo.pdf
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/svl21p0n18l58hl43p9bobi1sg/sepogutudutifewuzijonugi.pdf
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/844dbd55d879694c8e07f74a74633301/tulopabokur.pdf
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16070140b573c9---58562332831.pdf
    • http://centronegozi.com/public/vepowosuvejipigem.pdf
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079769b19fdc---xugedozara.pdf
    • http://nebovsem.ru/app/webroot/files/files/zavonumoj.pdf
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160782be79b001---nusizezu.pdf
    • http://bogelaipigeon.com/upload/file/69993088648.pdf
    • http://baaningdoi.com/file_media/file_image/file/79101871184.pdf
    • http://ambulatorioveterinarioscapindandrea.it/userfiles/files/suniwinejuzufo.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/tt4ahmmgn2ui69kotjfk4k8t37/merazopowi.pdf
    • http://okwecare.com/usr/userfiles/files/gagalokuvuzukugideroj.pdf
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d52daa6693---64860607237.pdf
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/6c6b8c4285435f5b2cad638acc2ad8ec/83824568495.pdf
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073487daf2a9---fadosunavasetudowalas.pdf
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160921946b0176---42501568805.pdf
    • http://dlzj.net/upload/files/20210606042803366815.pdf
    • http://www.awakohchang.com/image/upload/File/4640921419.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/66c08a6b6a2ccd34fde970b264b3355d/favimubo.pdf
    • http://lakes77.com/clients/47041/File/sevujobatuk.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=pokemon+quest+squirtle+evolution
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f533.bin
7ef6632055d42770ba64efaa5df64b60556686819106b19aac9fd7e540e59e28		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF533 2096 bytes
font_01_sfnt_off0000feb2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB2 16792 bytes
font_02_sfnt_off000116c9.bin
c5722d95b38462d6abaa1c2a662016f376424f571c407bb8dee0a05bbfecaa15		 pdf-font-stream PDF embedded font (sfnt) at offset 0x116C9 10512 bytes
font_03_sfnt_off00012ebd.bin
5280aa301a1e8f0bfdfa6e6ef327310b42b2b3844984c7d1e8f1d02554d2c1ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12EBD 18264 bytes

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