Malicious PDF — malware analysis report

Static analysis result for SHA-256 fca645c6b699814b…

MALICIOUS

PDF

76.7 KB Created: 2021-09-20 01:18:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 68581a2187c1d11624a251064faadd74 SHA-1: a1ada61420ae5f0d6e0957f91c1797cf51de316b SHA-256: fca645c6b699814b614771de04b9b53adf010642817526d7f3563011183cf9d3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://iphonerepairservice.nl/app/webroot/files/userfiles/files/30768129003.pdf In PDF document text
    • http://parzenica-bialka.pl/userfiles/files/61470151858.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142b648e306a---vojoninurinizuzi.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/zibilibukufedejebap.pdfIn PDF document text
    • https://ngoctraithaibinhduong.com/uploads/news_file/silafilorobenagamelu.pdfIn PDF document text
    • http://carmakers.cz/userfiles/files/80700203270.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/tikebebuved.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/161314768b0c51---15191723872.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/78050867618.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/magazotaletozezofomigorof.pdfIn PDF document text
    • http://traviet36.com/upload/files/puzox.pdfIn PDF document text
    • https://mimpishio2bet.com/contents/files/woxizonezogavi.pdfIn PDF document text
    • https://lesura.net/userfiles/file/zogukasufovosil.pdfIn PDF document text
    • http://www.bc-arman.kz/ckfinder/userfiles/files/74904285830.pdfIn PDF document text
    • http://tns-china.cn/editor_upload_image/file/56968969134.pdfIn PDF document text
    • http://www.vikingmaterials.com/img/soruwokezepuli.pdfIn PDF document text
    • http://landroverbh.com/ckfinder/userfiles/files/fejiterovuramufufisazafag.pdfIn PDF document text
    • http://superfasttv.com/uploads/files/gemumofiviketuzebuwane.pdfIn PDF document text
    • https://kaisar168.com/contents/files/70112785400.pdfIn PDF document text
    • https://htlexpress.com/ckfinder/userfiles/files/88977441912.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/161422b7989e37---30709822537.pdfIn PDF document text
    • http://hla.vn/upload/files/48684696230.pdfIn PDF document text
    • http://innova-perila.ru/upload/files/1656719376.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=dream+league+soccer+2014+classicPDF 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_off0000c51e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC51E 10844 bytes
SHA-256: 64ca8fd61eae964443e8dd082e05f01981a50a7691e5704b27b00533a555f611
font_01_sfnt_off0000de47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f659.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF659 18024 bytes
SHA-256: 334e160657edbaef05686a12364b508bce73609b1db1ff94bafac2fe66f39c6e