Malicious PDF — malware analysis report

Static analysis result for SHA-256 13e2e55050b9d560…

MALICIOUS

PDF

81.2 KB Created: 2021-09-03 07:47:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 11456bcaf3aeb071d2009c724ddf0afa SHA-1: 66346f03dd3862e31807a01f573ee8b0abcb37bd SHA-256: 13e2e55050b9d56070753fe4f41e62b671a3921e7243e47e12485f729c9b88ab
156 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution attempt. The presence of external URIs and link farms on disposable or compromised hosting further supports this. No scripts were extracted, and the document body was unreadable, but the heuristics strongly indicate malicious intent.

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://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073aadf3c3a7---zavotolegikiwigudibuwuw.pdf In PDF document text
    • http://aldobini.it/userfiles/files/xopubonipojugix.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f47a14419a8---92989293674.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/7df98be968faac3ec9be4cbc8491e218/jogomodutepomani.pdfIn PDF document text
    • http://teraval.cz/res/file/garujederokunivapoponisi.pdfIn PDF document text
    • https://samsungvrvklima.com/upload/ckfinder/files/nojoguwadoxuwafa.pdfIn PDF document text
    • https://tigercabinetry.com/wp-content/plugins/super-forms/uploads/php/files/1bf41b13ad616d2c247a99fc917abdc4/95600964853.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/v7rdfbm8gjcmk8h2ksss43v4a2/32801697126.pdfIn PDF document text
    • https://hawkseyetravels.com/assets/ckfinder/userfiles/files/xevipufi.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/16120e2cb40651---wuretefosumosava.pdfIn PDF document text
    • https://alutat.com/data/file/zolufa.pdfIn PDF document text
    • http://ontis.sk/editor_uploads/system/files/lekubavisasemosiruxufevon.pdfIn PDF document text
    • http://kientrucnhacuagio.com/upload/files/zibirojiral.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b9f5b4cb4e4---34853074493.pdfIn PDF document text
    • http://ipublicity.cz/data/file/wulutezugatojofelibogek.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/ae1e451694c778b23f3536b874b5a17b/vekiriripabefepem.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/01an99ukanmkpjb28iokgi5ms7/92757904013.pdfIn PDF document text
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/3836978874.pdfIn PDF document text
    • http://auapp.ch/userfiles/files/lidis.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/totrqpfn0578bk22udoutjsed8/51983681375.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/23598309064.pdfIn PDF document text
    • http://banphimchuot.com/userfiles/file/15273910342.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/6eb8d0edd1000e98b864335fb515dbb3/tubetosaro.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085977c4d172---16019307934.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=exploring+autocad+civil+3d+2018+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_off0000d33c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD33C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB53 11420 bytes
SHA-256: dbfe9ae3c78ac1c011132ba787db755adbd5a7bf37b61ed9e0242049fb9dd7c9
font_02_sfnt_off00010650.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10650 18632 bytes
SHA-256: a00d5ac7d245ae541b0e59e2c816cf053d401b53a1dcef518db5ce6daf3d0dcb