Malicious PDF — malware analysis report

Static analysis result for SHA-256 8acb10911f21e907…

MALICIOUS

PDF

81.3 KB Created: 2021-09-03 14:25:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2192aec1dfdf88ba5546226c0c3f9471 SHA-1: 742bcfd49c0a7c74550aa47f92020f9833d6859b SHA-256: 8acb10911f21e9076a3826d7e83fb42480fab3f60e7c5dd23669738e57325c58
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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 https://inwebjor.ru/uplcv?utm_term=sportsman+generator+1000+manual PDF link annotation
    • http://xn--2vxr09c6mc.tw/CKEdit/upload/files/rodawokafazokorobof.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/88774063954.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/12966441253.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/7ee7a48ab3d9f43646838c7b415fc917/tupaxumibekiwijaxip.pdfIn PDF document text
    • https://heuresromantiques.com/upload/files/wozumakirurovuwubuzi.pdfIn PDF document text
    • https://dodatnagarancija.com/userfiles/file/55083760746.pdfIn PDF document text
    • http://rajhansnursery.com/userfiles/file/bilaresis.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/1aecff774869aa2e3904db0ffb7ba4a7/46769355073.pdfIn PDF document text
    • https://www.agro-zavod.ru/app/webroot/js/ckfinder/userfiles/files/memaro.pdfIn PDF document text
    • http://bosch-service-center.ru/uploads/files/61185270441.pdfIn PDF document text
    • https://www.vek-bg.com/app/templates/js/ckfinder/userfiles/files/57884603399.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/guzamatezifamitaduket.pdfIn PDF document text
    • http://seidels-mineralienwelt.de/images/uploaded/file/jisejafopafujigapewekeki.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/15736547865.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/58ada0d426c427309711e91b52b261ee/79999181982.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1608bc3e4904ea---fapoge.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/pafal.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160f161547b8bb---pisez.pdfIn PDF document text
    • http://hataylezzeti.com/resimler/files/16590503539.pdfIn PDF document text
    • http://aimecostruzioni.it/userfiles/files/77296424307.pdfIn PDF document text
    • http://thanhlapcongtykiengiang.com/upload/ck/files/78551543884.pdfIn PDF document text
    • http://cissi.it/userfiles/files/sukumusefemamujaxunubun.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612575c870222---9566137349.pdfIn PDF document text
    • https://ap-qatar.com/userfiles/files/33293992020.pdfIn PDF document text
    • https://psg66.ru/admin/ckfinder/userfiles/files/siruvurosatuz.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/i59kumaltsq5792l918m8a2c95/fidosipuvaxifum.pdfIn PDF document text
    • http://studiopignotti.it/userfiles/files/93386691559.pdfIn PDF document text
    • 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_off0000d823.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD823 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f03a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF03A 10852 bytes
SHA-256: 38534407596cfaf2a060448bd30f2f616f0bdcf223f8ceb8fdd38bfe328fe42a
font_02_sfnt_off00010954.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10954 17492 bytes
SHA-256: 923e0bf7ddb4f6d9650c5c9bd44aae80cd8e2d590c35d5cdf2f8851140d0d924