Malicious PDF — malware analysis report

Static analysis result for SHA-256 d58af93d5af7bfb4…

MALICIOUS

PDF

74.7 KB Created: 2021-09-14 10:09:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2a65b6740f433af6e4356bfb75a68573 SHA-1: 50b8428bf9bfc1bf8e948f482f1fef8e4cf254f3 SHA-256: d58af93d5af7bfb421d7f51c299141867500dcf9a9d26c0bf09b92faa5988844
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple URLs pointing to potentially compromised websites, indicating an attempt to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. The presence of embedded JavaScript suggests it may be used to further exploit the user or download additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/soruminufo.pdf In PDF document text
    • http://2478.ru/admin/ckfinder/userfiles/files/gejejovujamirajitarag.pdfIn PDF document text
    • http://hoangle.vn/uploads/userfiles/file/72963317463.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614045e27b0af---rudow.pdfIn PDF document text
    • http://esistore.com/userfiles/file/54122289782.pdfIn PDF document text
    • https://datatalk.ilvzhou.com/upload/files/2021/09/202109030836093226.pdfIn PDF document text
    • https://yocarbroker.com/upload/ckfinder/files/12585573470.pdfIn PDF document text
    • http://sergeybazarov.ru/file/xifapote.pdfIn PDF document text
    • http://camberwelltaxi.com/survey/userfiles/files/xagukafo.pdfIn PDF document text
    • http://vektorma.ru/uploads/assets/file/63821094486.pdfIn PDF document text
    • https://uleiuri.ro/userfiles/file/kumonijimunipopa.pdfIn PDF document text
    • https://taiwan-tiaya.com/upload/tiaya_official/files/28138370431.pdfIn PDF document text
    • http://studioambienteterritorio.it/userfiles/files/rebisifewiduzesirexubikox.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613f5b65f2029---42201513390.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613e893327eb4---mapexojilonidozalukez.pdfIn PDF document text
    • http://confetti-seasons.ru/upload/files/97299807323.pdfIn PDF document text
    • http://formel1vermietung.de/userfiles/file/80483818954.pdfIn PDF document text
    • http://ingpoggi.eu/userfiles/files/basus.pdfIn PDF document text
    • http://ministerium.pt/files/96769714911.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a914fb4051---dafurisuvapeverajubuk.pdfIn PDF document text
    • http://jaatkinson.com/userimages/92088315041.pdfIn PDF document text
    • https://traffictkt.com/viking1/uploads/files/rovamafojituvorojepagema.pdfIn PDF document text
    • http://peach2560.xyz/js/ckfinder/userfiles/files/14567778460.pdfIn PDF document text
    • https://alummaswaja.com/yii/sdbalikpapan/home/images/upload/files/rusenixugi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=wep+hotspot+androidPDF 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_off0000c0f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d90c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD90C 10436 bytes
SHA-256: f94294e25bbda4fb5cf3759e18279eeec62a3bf450d57c0c0a1d0522254d0ef2
font_02_sfnt_off0000f0ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AB 17192 bytes
SHA-256: 2b7b9e2ecd4b0022ad71ddabc28a150f5e8afd1ba658bddd9c25d70841ae9fe4

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