Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dd2021fe325bc00…

MALICIOUS

PDF

84.4 KB Created: 2021-09-02 06:55:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 83a50242b382a971202b7a80ea549f32 SHA-1: c24e4445dcbec3effd6e3f1be795bb83739a58e0 SHA-256: 8dd2021fe325bc00c06b48a4926cc051931a5e5912c45c8c778e7d0971ca4edf
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains a link farm pointing to numerous distinct hosts, many of which appear to be compromised WordPress sites or disposable hosting, suggesting an attempt to distribute malware or conduct phishing. The document body is heavily obfuscated and unreadable, providing no direct user-facing content but reinforcing the suspicious nature of the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://industra.sk/userfiles/file/67256816484.pdf In PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/03afcda28e5a0d1721eca09e2d4f51c3/sakolazawi.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/72vgmssicrf36sih5uqv4k7amv/dupofawosulele.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/l4rjsusf5qf36e54u9c0iv0jjv/vujinudexuzunesojolabuxen.pdfIn PDF document text
    • https://aurorabersinar2.com/contents//files/2337432178.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/7k957m5d0s97nn04uc59qsl3b7/zitiw.pdfIn PDF document text
    • http://geometrabottero.it/userfiles/files/51231709910.pdfIn PDF document text
    • http://lateonsettay-sachs.org/userfiles/file/pugilituluwupumo.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093c8f08cd5d---99878461510.pdfIn PDF document text
    • http://ctnphrae.com/ckfinder/userfiles/files/3443447198.pdfIn PDF document text
    • http://abwhopewell.com/uploads/files/gegolerosuvi.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a6773940989---12885531722.pdfIn PDF document text
    • http://cuacuongiare.vn/upload/files/wijunubevujogegowunas.pdfIn PDF document text
    • http://tokstar.com/_UploadFile/Images/file/75234895063.pdfIn PDF document text
    • http://backyardreleaf.ca/clients/6/6a/6a4eaaf8452764cb6fc14c9064ed0c71/File/zivuvosipuputuzimirapar.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//55164735992.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c658e1bfe0d---mulolesoxupobir.pdfIn PDF document text
    • http://santamariamikado.com/uploads/files/40172967992.pdfIn PDF document text
    • http://phuwangnam.com/user_file/file/wesulabetutidebipub.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca15977fc1---73563869751.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/nutigabelepurifuvu.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/pukixef.pdfIn PDF document text
    • http://abroadster.com/files/pupatilur.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/0699778d59783eb7bff97c782f6f30d3/mowunuzusinokejem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=ringworm+is+caused+by+anPDF 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_off0000e508.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE508 17200 bytes
SHA-256: 6715df3f5d88f724a04ce6030132e8db2a18efcb26601daffe6bb013c3cd9074
font_01_sfnt_off00011111.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11111 11056 bytes
SHA-256: e10a49f683591d8a9b6e5d3c7ec3fb27539d78051daa5a833c2c81339c1eda1a
font_02_sfnt_off00012aaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1