Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff5a5df285be60ff…

MALICIOUS

PDF

91.1 KB Created: 2021-09-06 02:52:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: bffba8ed402acf5da56b0b79dc7332b7 SHA-1: 652a8bcc8f0da9311cb00c69293f3a431150e592 SHA-256: ff5a5df285be60ff70f16f717fbc7f47fe852385190f0162d5181f07d2ad9cca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting. Heuristics indicate this is a link farm designed to direct users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • 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://czechdidgeridoo.com/admin/upload/file/74818998399.pdf In PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/c8288a08c31adb03a023f374244b749a/26920222536.pdfIn PDF document text
    • http://cdkkck.com/uploadfile/file/20210808220540.pdfIn PDF document text
    • http://dhf-china.com/d/files/puxexo.pdfIn PDF document text
    • http://stalmont.eu/userfiles/file/tiziduwarasas.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075825ea7fb7---2963590304.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160703745e8181---forevovijisun.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c114932c58a---82527664240.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16081478e34fdf---30358284872.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/49c32k3l8362fflbciouhem872/budowitofozezuv.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607da7c2f3326---16615518125.pdfIn PDF document text
    • http://gyarmatilovastorna.hu/userfiles/file/selifat.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/dec0b9e012e7af99bf1177f86ffb2f41/janobobugupomafigonewitab.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/65429742228.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/xazajaruzusujuzad.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce0533d85ef---baropelibilesotunedijeke.pdfIn PDF document text
    • http://tid.vn/upload/files/46484345767.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160728a2a96e34---69935491689.pdfIn PDF document text
    • http://eko-uklid.com/files/file/51399470832.pdfIn PDF document text
    • https://propactionvehiclesuk.tv/userfiles/files/wodunal.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/o6j9l8pt0j00i4rm2j2h0n0rp4/67301307029.pdfIn PDF document text
    • http://www.rannatennis.ee/data/upfiles/files/32214954175.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.com/ckfinder/userfiles/files/sebugibozuvalivabavadipiw.pdfIn PDF document text
    • https://mcsfood.com/images/file/logenaniwoxejavewutivo.pdfIn PDF document text
    • http://acrclubinversores.com/files/galeria/files/gofiwutitenezin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=punjab+text+book+chemistry+9th+class+pdfPDF 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_off0000fb18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001132f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1132F 11732 bytes
SHA-256: 5bdc92598d6163400fc8f64ae5d6db28364654f54fd235b804d47f2781ff5cc6
font_02_sfnt_off00012ed0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ED0 18192 bytes
SHA-256: c1391fbe766c40f2c5f0543a4d867697f5a88c7c1dd0fac2dae7c4fcb5ca9f18