Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a6b46c40cdeb9de…

MALICIOUS

PDF

98.0 KB Created: 2021-07-01 09:37:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: da20506cdb965d083610a7471fecfa10 SHA-1: 5c0db168af19a56bc9bd953bb7076dd3116e3e78 SHA-256: 7a6b46c40cdeb9de03c1b34c7751c6705a2aa7a86f194702cb76f7ec87214ef2
96 Risk Score

Malware Insights

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

The PDF file exhibits characteristics of a link farm, with numerous embedded URLs pointing to potentially compromised WordPress sites. The ML classifier strongly indicates maliciousness, and the presence of multiple distinct hosts hosting PDF files suggests an attempt to distribute or obscure malicious links. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

Heuristics 5

  • 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://wchs65.org/clients/b/bb/bb65574a37642f7fe3135935df861e67/File/96153927058.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/6m78vqlejikpqv3fuc6dfkmvu3/18771043089.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/72olfne4ls5dsh7rd476bdfkte/45756288628.pdf
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfe25f18dc1---putadijud.pdf
    • http://miracleschoolministries.com/survey/userfiles/files/fimuzop.pdf
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607473bd6dfb5---tewopafitogen.pdf
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/3f8fcf2d6a7132a1662468d2141ee956/55305215059.pdf
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609b228e18e2d---suduwanugo.pdf
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/50dd7308adcd581b69ab74511b54f0e0/roxedidotobonuli.pdf
    • http://densayhongngoai.com/uploads/userfiles/file/repimutodaxogilajiwi.pdf
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/a45c597f70d740efe5ee595622ee9638/49642367156.pdf
    • http://lubrifianti-auto.ro/files/file/nekuv.pdf
    • http://sshs1962.info/clients/3/33/33dcd814b32da85629335a95ab3d0158/File/480596228.pdf
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606d50d568faf---48767550981.pdf
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16088c52eb4f4e---joxevokuperuveginizariwas.pdf
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/o7qu65gpgb0hne02lrg0193u0d/lirox.pdf
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/c550c8a417067e36cbb49ad061db9673/60146715892.pdf
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606c96a87d742---rakuzijiroror.pdf
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0fa492af3---kanidexidezuzepamumi.pdf
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b106c2b54cc---12183035039.pdf
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083a84cca1f7---vaxazimejorukupo.pdf
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/rfb1ummf87re5no97oimpt36rs/42000160789.pdf
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/3beb60597604d9680ca1d6e1a35b772c/30709722749.pdf
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/2f1cf9d28a778c7603c6d6ba1262d7e8/kilusogokemum.pdf
    • http://maychamsocda.vn/images/userfiles/file/25812503576.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+find+the+treasure+in+minecraft
    • 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_off00011c8e.bin
80f019b16b924929b340207c27563ef60567d264bb0cb1949ee7fd461831ba24		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C8E 10872 bytes
font_01_sfnt_off00013586.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13586 16792 bytes
font_02_sfnt_off00014d98.bin
a28c17827022d0251d37825d1801f7c137d38ccf1d8f9af34c44805e71cfe266		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14D98 17408 bytes

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