Malicious PDF — malware analysis report

Static analysis result for SHA-256 80dbf05eac2d268b…

MALICIOUS

PDF

90.8 KB Created: 2021-06-29 17:15:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6554e13c9adec0c380274e89cf99fdbb SHA-1: 2fa600d18aff8723a1d7956a8b4c180e2107a5f4 SHA-256: 80dbf05eac2d268b6dfd03fa0086907498682f7b8681d6b54bf2786f495018a5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. It also features a link farm pointing to compromised WordPress uploads and other disposable hosting, indicating an attempt to obscure the final destination and likely distribute phishing content or malware. The ClamAV detection and ML classifier strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce9dd3ea97---53726961551.pdf
    • http://perechen-jurnalov.ru/js/ckfinder/userfiles/files/63777273980.pdf
    • http://asustainable.com/global/file/62184496367.pdf
    • http://ceresasrl.it/userfiles/files/linamokapilowejenofog.pdf
    • http://arunimaflavours.com/userfiles/file/9700532444.pdf
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/e261737032177b7df39bc7939580ae74/65225695025.pdf
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/3ggt6i2m28i4lmp48hu4j6q21f/22264658412.pdf
    • http://everbeenmagnet.com/js/upfiles/files/67481131136.pdf
    • https://bostoncake888.com/UserFiles/files/gagozelovesela.pdf
    • http://gernano.eu/gfx/userfiles/files/78826666336.pdf
    • https://ntwbearing.com/UserFiles/File/50540293878.pdf
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff6160d949---43112099737.pdf
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/hb0l8ag8qs71j1iivkes1e1qj1/fusalonilan.pdf
    • http://canphantich.net/Images_upload/files/foladizojokilewu.pdf
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/u9jc86pg130ipp00k7al5skpvn/gupoweduxuleruwogosesopib.pdf
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb6172e98a---36061047035.pdf
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16087cb1fb4e70---mapetorisefopuwesapugeje.pdf
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/ef4adff37ff984126d4a0e024067b922/tomukotarepenatonizuko.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/dc536fa133bfaa14281a3c1b8f627546/77211274537.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/087dba6d45051446401211a5103abb4c/40109590109.pdf
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160a373609a710---33010417013.pdf
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/8mpfkjnaouevpgpjkdqqrnenpc/dawulekefipixure.pdf
    • https://joebalogh.ro/imagini_ws/xekut.pdf
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160821d4b82bff---zaxiridosazesisedo.pdf
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/g58f7hos4mqnhjb56spfhuqgm2/roxuvimemeterima.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=their+eyes+were+watching+god+questions+and+answers
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff8b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF8B 16792 bytes
font_01_sfnt_off0001179d.bin
c6f7fe205ae4aabfde5514a78c28e80e7cfa94efb497f59eec80ecc0bf276c2f
pdf-font-stream PDF embedded font (sfnt) at offset 0x1179D 17452 bytes
font_02_sfnt_off00014479.bin
4a5ccb238808190fd0901ec836c883b360e433ee7538cf9ed8e95a6d08937f84
pdf-font-stream PDF embedded font (sfnt) at offset 0x14479 11012 bytes