Malicious PDF — malware analysis report

Static analysis result for SHA-256 1aebbbaec159f43e…

MALICIOUS

PDF

92.8 KB Created: 2021-06-27 17:46:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c45fd495d0bc1ca32aa97459d94b8f93 SHA-1: ba72b2a34b674d060819d2a71784b01b614acb46 SHA-256: 1aebbbaec159f43eb4416fdffc20834fc5ca052fb7f1d6bc83957aeb089556c7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF contains a link farm pointing to multiple compromised WordPress sites, which in turn host other PDF files. This structure suggests a phishing or malware distribution campaign where users are lured to click on links that ultimately lead to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609b4107c06ff---jizozopiwaduzedamozet.pdf
    • https://gionggiacam.com/ckfinder/userfiles/files/62506496150.pdf
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/7bsggohgeklf3cfntbfpaccnjl/52521719768.pdf
    • http://vogiantinhmach.com/media/ftp/file/xafekusadulazekoxininuk.pdf
    • http://houselandia.ru/files/wogoworugu.pdf
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/e2f0ef6010b0edb5b63395951dcb4c5b/mipiliwexavifafusatokuf.pdf
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160a92f0dbb598---79587819761.pdf
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/bjvtmtrvh1jqsr9v7lanns5k6h/69682417883.pdf
    • http://thegibbsfamilyreunion.com/clients/d/d9/d929505c7faf6263097cc97620c39d65/File/45257705793.pdf
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/55e05d290a352a9c08ed166df324ff35/19117394763.pdf
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160982c37e9c33---wizudukijugojivunulob.pdf
    • http://www.dean-cpa.com/files/adminpic/file/68305150954.pdf
    • http://sjar-tech.com/uploadfile/file///2021062017223989.pdf
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/5cunicvsdfabd66ebgml5ulgk4/dubazuwodove.pdf
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f46cb6dd89---dutazokajaditobelaliwazaj.pdf
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/v2779jfrp6iaokaa3clivkqtfq/6809894495.pdf
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/3v40pt2hgrolell89p3do5soba/pegopozen.pdf
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/s1pl04e4g0n2cs7ecaj8e1t6b6/70116730631.pdf
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/e73c2a8120f61c92f9c1b88ec11aad61/fonusinuxawotalosel.pdf
    • http://derma-dts.de/files/file/kojivotivufibusiv.pdf
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/16079d36854117---rexigovofunetokavolis.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/8rkb13qrjvgdtjdv7c9f36ofr0/wedajewoz.pdf
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160bbcbcbd73ff---6938817508.pdf
    • http://phantasos.org/userfiles/file/gexoxosugewidi.pdf
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/gn211qjp96tmbusnhmga4ko9v4/71992786594.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=ncv+test+of+4+limbs+cost
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef24.bin
d7ecfe5c0467bdfbe75106cf07648fe3ff194e0e7dcc60225ea7154cb4f4a3c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF24 17004 bytes
font_01_sfnt_off00010719.bin
62b95799a2d9e529175823ed9b147a5352977ece01a3499db4ff235e1c442416		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10719 17724 bytes
font_02_sfnt_off000135a7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x135A7 16792 bytes
font_03_sfnt_off00014dbe.bin
81bd77e5d563d28bc6c0052df24b5a044e7eb57211a161fc08dba3eaf5c78d5e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14DBE 10392 bytes

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