Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe4be7453283f859…

MALICIOUS

PDF

86.9 KB Created: 2021-08-19 20:54:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2409e3c3f3c0bdb9eb4c3379953485ff SHA-1: 4429459b81e95c3468544bd7b49ea74887d04762 SHA-256: fe4be7453283f859939ad54212ca16c2e934603c20e413a511b51091fd3b92cc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to disposable hosting or compromised WordPress sites, suggesting a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs and the nature of the heuristics point towards a phishing or malware delivery mechanism disguised as a search result for a product manual.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://huntic.ru/uplcv?utm_term=honeywell+programmable+thermostat+manual+rth2300b PDF link annotation
    • http://skyrybupaslaugos.lt/uploads/files/rulemixewitigab.pdfIn PDF document text
    • http://dharmapremipariwar.org/userfiles/file/rilajetuvudulozobewakek.pdfIn PDF document text
    • http://ritadas.in/userfiles/file/luwojojebed.pdfIn PDF document text
    • https://hearing-outlet.com/uploads//files/202108040646424358.pdfIn PDF document text
    • http://snap-drone.com/userfiles/file/56783085237.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611c452364969---dajonefo.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16082e7d4c5e37---satowoxaj.pdfIn PDF document text
    • https://bloomland.com/sites/bloomland.com/files/keboxevanuwatawukevelap.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609191b5d8d28---joloborebeganizamafelene.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/1f1d171f44ca35f4cce50933274bcd0b/60575734645.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/nbm4cc63q43gs40q5iejoc8o8r/32588434940.pdfIn PDF document text
    • https://szaniterplaza.hu/ckfinder/userfiles/files/fetupelus.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b261cf3357e---zenedexebajodasajokab.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/5ai253focmhf69ruldtdruchha/fanisajipakikututisamawot.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16094ae5709b75---podidufewej.pdfIn PDF document text
    • https://istocdukkan.com/userfiles/files/nogopogabawowusaputegakox.pdfIn PDF document text
    • https://ijpdua.com/contents//files/besenupezumivogi.pdfIn PDF document text
    • https://taperagi.com/contents//files/walexubikuvupatezo.pdfIn PDF document text
    • http://chromoink.com/updates/file/98349099276.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/9cbdc9cd61ef854176184002f73caf42/55761953196.pdfIn PDF document text
    • https://www.winsum.frl/ckfinder/userfiles/files/95201627866.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad87e27f038---jelaxe.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/kivomekezupapajimom.pdfIn PDF document text
    • 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_off0000ee93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000106a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A5 16824 bytes
SHA-256: 528c5d4f89dc31feecd47a8b914811ca73c0b9c4bd4566eb291fd13b02335cb0
font_02_sfnt_off00013262.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13262 11452 bytes
SHA-256: 8484f46d5aea4292b7252240f375a630d772918d9539fdf80ae344d37da0e55e

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