Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfaac952ea2d384e…

MALICIOUS

PDF

84.4 KB Created: 2021-07-09 00:53:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 05d1eaa56a57f0c639d1e3fdffe69a9d SHA-1: 2e31786be0c6293b023d23957b5e66f1129a7b12 SHA-256: cfaac952ea2d384e0f31c39e0a679410c4d7ee47f50e807a1644b2e44ae58cbd
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 WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these external sites, which are designed to host phishing content or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://queure.ru/uplcv?utm_term=first+conditional+form+structure
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/l6hv45e23j6j1b44gfpfpqeorr/25968307720.pdf
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fe1ca50b3a---38738854099.pdf
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160ac5bdbc8089---12532567269.pdf
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608254938099a---94042712434.pdf
    • https://soccerauquebec.com/userfiles/file/pederi.pdf
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/hffi8e7utesstmovrctqpjo044/32522592740.pdf
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/4312502c7f6ec011daac8177c2501272/89477542761.pdf
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/rkjkemj718lc33606l0b81fmb2/vuloxe.pdf
    • https://designcoordinators.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1d7b97e84---zuzinakiwatuxegowiza.pdf
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/c2e507b82d53e62a5180e8b4838e2d60/88643985502.pdf
    • https://imad0c0.com/js/ckfinder/userfiles/files/36868356593.pdf
    • http://debsluxe.com/clients/1/17/174397649ed9f07baa8f9d9f48c72a4d/File/62364297487.pdf
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/8304cbaa5a9f434ec17e7b46f4aa4901/zuxusukivakotefoguwolak.pdf
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160e5f674dafa2---pevimirugifob.pdf
    • https://hoangphatdanang.com/uploads/image/files/wofumudularidosudev.pdf
    • http://soupworld.de/upload/file/17324465828.pdf
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f04e19679b---58822130109.pdf
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb10a2310e---nedikodowa.pdf
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/nn4rer1a2eb1ckki7utd8bfro5/41297676351.pdf
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/8cftpo8t9efcn3nim5lpd1lqn9/gixixuluwatukumojuwozeku.pdf
    • http://aaaexpressac.com/userfiles/file/zeluvisuk.pdf
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/a3314417124f03cec8d1b50a8e5ecd23/didemedo.pdf
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc2a983c937---ruvufegula.pdf
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160701cfb0ce8d---nogiliki.pdf
    • 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_off0000e715.bin
cc0804ec12bf6ab38929edc0d017c07d296b2f516d4252422d178d47885acf79
pdf-font-stream PDF embedded font (sfnt) at offset 0xE715 10712 bytes
font_01_sfnt_off0000ffaf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFAF 16792 bytes
font_02_sfnt_off000117c1.bin
e5acff32ec17aeb1c5a4d82c1baa39bb92bea133ef0f89ed0a72735d7385813b
pdf-font-stream PDF embedded font (sfnt) at offset 0x117C1 17148 bytes