Malicious PDF — malware analysis report

Static analysis result for SHA-256 66900a0287e20657…

MALICIOUS

PDF

87.5 KB Created: 2021-06-28 15:01:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 95e3cfd6285adf2ff5eb58c4e631062b SHA-1: 8f7b60c0d2d4941da8de4110d59e04b859cc108c SHA-256: 66900a0287e2065794b134e4790e909e0fdfd3332ce51ac0d2e8d692d3ccdc82
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains a link farm with multiple URLs pointing to compromised WordPress upload directories, suggesting an attempt to host malicious content. The presence of these links indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbd0b50e32---22328613067.pdf In PDF document text
    • http://alkanboya.com/files/file///xotekijegikujinikolesusal.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/t994vj25v01dkic2706855rcil/fukafekatipizezo.pdfIn PDF document text
    • http://deltastal.ru/userfiles/file/92654491994.pdfIn PDF document text
    • http://ambvetfanini.eu/userfiles/files/60010331963.pdfIn PDF document text
    • https://batikatravels.com/userfiles/file/48104787505.pdfIn PDF document text
    • http://cecev.com/stockages/files/92571419411.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c66beed672a---lorepoguzukejogu.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1609f493425745---61853174588.pdfIn PDF document text
    • http://tingyi-bnb.com/CKEdit/upload/files/babujasitabomaweviposipa.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16080ca1eabeb2---74091761776.pdfIn PDF document text
    • http://summitremodelinginc.com/userfiles/files/budelikowalifu.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1608041e6c9fda---76733564216.pdfIn PDF document text
    • http://fitviewer.biz/files/file/64013689590.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/tetelopivo.pdfIn PDF document text
    • http://collegium-connect.nl/ckupload/files/26675600273.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/49241136449.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/nazoseb.pdfIn PDF document text
    • http://shuimotongyuan.com/userfiles/file/vefarome.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/663f4410532be0aa62b92a265ac99513/bijuwadusaz.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/25624058743.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/5204a72f8585d661e147bc341b74c700/biroko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+draw+a+girl+for+beginnersPDF 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_off0000f1b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B1 17180 bytes
SHA-256: f3b338809cbcb186d77d9b1eaa0425b8ff5715c646ba86901d453c0ca5f6a8c2
font_01_sfnt_off00011e51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013668.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13668 10744 bytes
SHA-256: 3999a647ebf90947fa7963838ecebdd7d28e6142b93e95de5de1358733dad93e