Malicious PDF — malware analysis report

Static analysis result for SHA-256 87574c7501d083d3…

MALICIOUS

PDF

96.2 KB Created: 2021-07-19 03:19:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 54ff7fda95e268881d74457fe201b4cf SHA-1: a85b7363f12169a0f3c3bb5f34c43d8cca7c281a SHA-256: 87574c7501d083d3c872eed28ae41ca070b05eb0e374d2da3623b9ff1c476b8b
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 a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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 http://granite1962.com/clients/869125/File/64758228938.pdf In PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084c64a1ec01---33936905312.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/0b34aeb6d82ba97c636978e7a5b06d54/tivedokojixigosasof.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160dce0ade8fd5---kabapodovewugewapo.pdfIn PDF document text
    • http://wallawallahighschool1968.org/clients/75819/File/99316253260.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/bexok.pdfIn PDF document text
    • http://smartdeal.pl/files/upload/files/89224693204.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/019b33f5ceb0881e1da85bb44c4475fc/vixupufikaxoxomo.pdfIn PDF document text
    • http://epoch-making.jp/js/upload/files/86791792437.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/8a9e12327e6d3d222b439625fc210bc5/tekomamemepijatevebepokum.pdfIn PDF document text
    • https://activepymes.com/pub/file/42651477802.pdfIn PDF document text
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072a84f704d0---27980798865.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/b3127b98a99ef983ca42fa402c104451/domedutozapebosukaxapokor.pdfIn PDF document text
    • http://geoodwierty.pl/files/file/pudewazirigupu.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/nv93hrpc4feefe723jr32ufnmh/fovenobagewolefuwamawu.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab12950bee4---kedivokeripemekegigu.pdfIn PDF document text
    • http://studiotecniconuti.it/userfiles/files/20308334011.pdfIn PDF document text
    • https://cicadit.ro/UserFiles/file/60711846415.pdfIn PDF document text
    • http://dancedynamicsla.com/clients/38740/File/sidutapikozadixu.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160881783b257c---21346690165.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081fdc6568ce---wogarufunisilunuve.pdfIn PDF document text
    • http://seventyfirstclassof69.com/clients/60772/File/17200207724.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/64c6793bea82315938efd17f7e2f682f/kirusobatututodamotokol.pdfIn PDF document text
    • http://18554080.com/userfiles/file/nowuvagusepodifubagajogo.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/f933d65082ce7a9769b18fdd46696971/vudunirumojisosigipefu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=clause+types+in+english+grammarPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000111ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012a00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A00 17824 bytes
SHA-256: 6782bb2022ebe3e1fc0104e0db453f84d3391969c66a3fd1df26aa0b563beeae
font_02_sfnt_off000158fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158FC 10824 bytes
SHA-256: 03b852787abf46f9d250abfc89a680b95e52863c8e787322c5f564a9bae533b1