Malicious PDF — malware analysis report

Static analysis result for SHA-256 327181727d1b7b22…

MALICIOUS

PDF

82.4 KB Created: 2021-09-02 00:44:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b29a4fa4b41c022aa842c669daa311ac SHA-1: c96610e1356c0b48d6ecd9336a03646562570a9d SHA-256: 327181727d1b7b22516eda496401888725c529665740bd299ce1dc1347ea361c
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to various websites, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or SEO spam. The presence of multiple external URIs and a link farm structure suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://pizzeriadevita.it/userfiles/files/kuludaludefomowuk.pdf In PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/e0ba8cbbfb46727b443144072a520be4/kowobuvufugamemitivopumig.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/kozekulikep.pdfIn PDF document text
    • https://ecoretras.com/file/felode.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607879b24ae09---gapulovakakosafikapipiga.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/radubipeketomub.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608549d706585---jiwebizimomu.pdfIn PDF document text
    • https://northwestconvention.cz/data/files/mujawizifapatokituzobov.pdfIn PDF document text
    • http://graviroz.hu/ckfinder/userfiles/files/80039299671.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d354d71116---poxafigupalinomanojuva.pdfIn PDF document text
    • https://monographie.com/ckfinder/userfiles/files/98621309740.pdfIn PDF document text
    • http://willbramephotography.com/99875410663.pdfIn PDF document text
    • https://dhesient.com/media/42990780604.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/de48c77a2e4ae8bb31135b77c090c752/28197701119.pdfIn PDF document text
    • http://oishisushigd.com/uploads/files/pasofafurixeripetuxul.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161217f05c69b7---bukopoxarabufasasazilil.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/nt997o5vuaue6l6r8n06nspnkr/99747846535.pdfIn PDF document text
    • http://lnshiyue.com/userfiles/file/20210803091104_400009056.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/58hhfq4mspuplhg082cbk25bs7/jarabuvodageju.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/3641932206.pdfIn PDF document text
    • https://gadd-asso.org/userfiles/file/66204831266.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a538eb037fc---66666944854.pdfIn PDF document text
    • https://art-lamps-rali.eu/files/file/99251384819.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1611d1cbccf962---zojabaxasirazivifugokomiv.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/44584880264.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=layer+command+in+autocad+pdfPDF 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_off0000de5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE5B 10736 bytes
SHA-256: bb129284fdeba8b5231fef622ba6772c6c4de39b4666959e0c11661406a109aa
font_01_sfnt_off0000f709.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF709 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F1B 17088 bytes
SHA-256: efebd4f4b245ba99205085982f5e94fd2fcbcd9c077c2b73654c2efbfce88f12

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