Malicious PDF — malware analysis report

Static analysis result for SHA-256 762e15f79a6a917b…

MALICIOUS

PDF

89.1 KB Created: 2021-08-01 01:26:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 83d36eecc3f9d3957a803825b4e23917 SHA-1: aba5dc4ef16522be14798b985728b7c0a72b55a9 SHA-256: 762e15f79a6a917b9d41777ed5c95eae64d88788ac8eb5ea8147947a0d9d5d4b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution via these links. The presence of embedded JavaScript suggests an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://mikomisushi.com/uploads/files/pakusukesos.pdf
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/o1an19nfph4dqe7oadc2df7tdj/88716701533.pdf
    • http://piotrkowska77.pl/zdjeciafile/11393799459.pdf
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/p9q19766tual5s6pb9bq19d7t0/nukarebigegini.pdf
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160968ada656b1---tovemexeporedagibalon.pdf
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/8858fa1f01af27813d82e33095eea8cc/tibitivulesax.pdf
    • http://tsutae-f.com/js/upload/files/fojesavem.pdf
    • https://dodatnojamstvo.com/userfiles/file/82181126311.pdf
    • http://logisticsnetworks.net/ckfinder/userfiles/files/molalupexisizati.pdf
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cbef606efc0---wolumuxipimujej.pdf
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160800954a3534---88453718757.pdf
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/7ab41e1c0c714031608ec668454ee992/71116746474.pdf
    • https://rumusjitu.com/contents//files/mobawozi.pdf
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/nrv8bg3p42uj9e1g17tnd4c7u7/dovemujoramaxejif.pdf
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/q5fish05s5np33j3jkibe2h4a5/sugerubater.pdf
    • http://www.ddu-hk.cz/ckfinder/userfiles/files/44465467131.pdf
    • http://win-sonic.com/kida2018/ck_imgs/files/51209992189.pdf
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c67e660d1f9---70270272511.pdf
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/4945c934d30247f58dd1bc6942999ee2/kemosezanizenowovix.pdf
    • https://siahotel.com/userfiles/files/27515494514.pdf
    • https://spcinternational.in/ckfinder/userfiles/files/nelinilavesawi.pdf
    • http://amsaneeraus.fi/userfiles/files/xadajofitudoz.pdf
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a06af48c416---zowibugogitezule.pdf
    • http://annandale1963.com/clients/69704/File/602134298.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/3ce5f96e40bca330535b3ca98baab4f7/winulagawekus.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=uniform+circular+motion+simulation+worksheet+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_off0000f884.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF884 16792 bytes
font_01_sfnt_off00011096.bin
3d6d40ffa1533aa33bb15ad30faaac5d1e7a3828a9c745cb2431cd2dad6182ab
pdf-font-stream PDF embedded font (sfnt) at offset 0x11096 16800 bytes
font_02_sfnt_off00013c37.bin
2780512bc397de7ad94d1aa6c3fd531086f5c01df7897cb80bb56aeae3e12059
pdf-font-stream PDF embedded font (sfnt) at offset 0x13C37 10884 bytes