Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd666de2bc139092…

MALICIOUS

PDF

99.1 KB Created: 2021-07-30 09:01:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 833656511508e2b22fdcab0b68714689 SHA-1: d0361752f08a0ad9bce37a6d3effa234dfcd296e SHA-256: bd666de2bc13909256a7cf8512375d00a0e94d757e6998a9fca143847b009dfd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads. The presence of embedded URLs and the nature of the link farm suggest an attempt to lead users to phishing sites or download further malware, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9880

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://tsg-edinstvo.ru/userfiles/file/173510451.pdf In PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/b04a3c9afc47538850ba7901a02a74bb/66258656329.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/zegupomobitozob.pdfIn PDF document text
    • http://remproekt-m.ru/admin/ckfinder/userfiles/files/bajed.pdfIn PDF document text
    • http://wjcopy.com/upload/files/35807324152.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a727548f375---sesagide.pdfIn PDF document text
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/a751229fb1797c010ab6a930b7c814cd/zidagopofonarejapezoja.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/679a8a651ad7c6824269c182022be0ef/63443731670.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/45d94a45aa5a38722a2f78e193d74994/44680572917.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/burituja.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/murujefateletesa.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b273d9594a1---jemadegubuxarifere.pdfIn PDF document text
    • http://casaalu.com/luutru/files/meduzukubevamilepazebe.pdfIn PDF document text
    • http://wellogo.in/userfiles/file///kovitu.pdfIn PDF document text
    • http://usmleworkout.com/files/file/busitemaserejafugaviw.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f0e504e3b13---49284655289.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160fa387ad0d81---lazisagukuve.pdfIn PDF document text
    • http://donateagift.eu/userfiles/file/18949786938.pdfIn PDF document text
    • http://baldonimarcostudio.eu/userfiles/files/75810225737.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/t1gk1shd17ktrsc4b86f7kjvu4/rejeziwijaxobakuxubuliw.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bb3ab8a5137---zuterobenavusepofup.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/14656960004.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f25742777---dupuvuruxisewafezike.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad46ff5f268---raramodakexavulez.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/68625218868.pdfIn PDF document text
    • https://kalyna.ua/sites/default/files/userfiles/file/68247900310.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=bosch+300+series+dishwasher+not+workingPDF link annotation
    • https://rt9.rspo.org/ckfinder/userfiles/files/disilosubowuwivivowe.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_off00011c89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000134a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134A0 11128 bytes
SHA-256: 03bcfc7f1e7e8f404b7483c83144642925318fea799ff150df94c59d311cdc0f
font_02_sfnt_off00014e82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E82 17908 bytes
SHA-256: ca3fe66f50d649bad5ab5abbcc6f8424d582eeef0095cac3526c976d04861442